Prioritize user privacy and data security in your app. Discuss best practices for data handling, user consent, and security measures to protect user information.

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Using provision profile to access assessments triggers a keychain popup
Hello! I do know apple does not support electron, but I do not think this is an electron related issue, rather something I am doing wrong. I'd be curious to find out why the keychain login is happenning after my app has been signed with the bundleid, entitlements, and provision profile. Before using the provision profile I did not have this issue, but it is needed for assessments feature. I'm trying to ship an Electron / macOS desktop app that must run inside Automatic Assessment Configuration. The build signs and notarizes successfully, and assessment mode itself starts on Apple-arm64 machines, but every single launch shows the system dialog that asks to allow access to the "login" keychain. The dialog appears on totally fresh user accounts, so it's not tied to anything I store there. It has happened ever since I have added the provision profile to the electron builder to finally test assessment out. entitlements.inherit.plist keys <key>com.apple.security.cs.allow-jit</key> <true/> <key>com.apple.security.cs.allow-unsigned-executable-memory</key> <true/> entitlements.plist keys: <key>com.apple.security.cs.allow-jit</key> <true/> <key>com.apple.security.cs.allow-unsigned-executable-memory</key> <true/> <key>com.apple.developer.automatic-assessment-configuration</key> <true/> I'm honestly not sure whether the keychain is expected, but I have tried a lot of entitlement combinations to get rid of It. Electron builder is doing the signing, and we manually use the notary tool to notarize but probably irrelevant. mac: { notarize: false, target: 'dir', entitlements: 'buildResources/entitlements.mac.plist', provisioningProfile: 'buildResources/xyu.provisionprofile', entitlementsInherit: 'buildResources/entitlements.mac.inherit.plist', Any lead is welcome!
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Jun ’25
When is the kTCCServiceEndpointSecurityClient permission set by macOS?
[Q] When is the kTCCServiceEndpointSecurityClient set by macOS and in which conditions? From what I'm gathering, the kTCCServiceEndpointSecurityClient can not be set by a configuration profile and the end user can only grant full disk access. I searched for documentation on Apple's develop website (with the "kTCCServiceEndpointSecurityClient" search) and did not get any useful result. Using a more complete search engine, or the forum search engine, only points to the old annoying big bug in macOS Ventura. The problem I'm investigating is showing a process being listed as getting granted kTCCServiceEndpointSecurityClient permissions in the TCC database when: it's not an Endpoint Security client. it does not have the ES Client entitlement. the bundle of the process includes another process that is an ES Client and is spawn-ed by this process but I don't see why this should have an impact. This process is supposed to have been granted kTCCServiceSystemPolicyAllFiles via end user interaction or configuration profile. AFAIK, the kTCCServiceEndpointSecurityClient permission can only be set by macOS itself. So this looks like to be either a bug in macOS, an undocumented behavior or I'm missing something. Hence the initial question. macOS 15.7.3 / Apple Silicon
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Feb ’26
DCError.invalidInput on generateAssertion() - Affecting Small Subset of Users
Issue Summary I'm encountering a DCError.invalidInput error when calling DCAppAttestService.shared.generateAssertion() in my App Attest implementation. This issue affects only a small subset of users - the majority of users can successfully complete both attestation and assertion flows without any issues. According to Apple Engineer feedback, there might be a small implementation issue in my code. Key Observations Success Rate: ~95% of users complete the flow successfully Failure Pattern: The remaining ~5% consistently fail at assertion generation Key Length: Logs show key length of 44 characters for both successful and failing cases Consistency: Users who experience the error tend to experience it consistently Platform: Issue observed across different iOS versions and device types Environment iOS App Attest implementation Using DCAppAttestService for both attestation and assertion Custom relying party server communication Issue affects ~5% of users consistently Key Implementation Details 1. Attestation Flow (Working) The attestation process works correctly: // Generate key and attest (successful for all users) self.attestService.generateKey { keyId, keyIdError in guard keyIdError == nil, let keyId = keyId else { return completionHandler(.failure(.dcError(keyIdError as! DCError))) } // Note: keyId length is consistently 44 characters for both successful and failing users // Attest key with Apple servers self.attestKey(keyId, clientData: clientData) { result in // ... verification with RP server // Key is successfully stored for ALL users (including those who later fail at assertion) } } 2. Assertion Flow (Failing for ~5% of Users with invalidInput) The assertion generation fails for a consistent subset of users: // Get assertion data from RP server self.assertRelyingParty.getAssertionData(kid, with: data) { result in switch result { case .success(let receivedData): let session = receivedData.session let clientData = receivedData.clientData let hash = clientData.toSHA256() // SHA256 hash of client data // THIS CALL FAILS WITH invalidInput for ~5% of users // Same keyId (44 chars) that worked for attestation self.attestService.generateAssertion(kid, clientDataHash: hash) { assertion, err in guard err == nil, let assertion = assertion else { // Error: DCError.invalidInput if let err = err as? DCError, err.code == .invalidKey { return reattestAndAssert(.invalidKey, completionHandler) } else { return completionHandler(.failure(.dcError(err as! DCError))) } } // ... verification logic } } } 3. Client Data Structure Client data JSON structure (identical for successful and failing users): // For attestation (works for all users) let clientData = ["challenge": receivedData.challenge] // For assertion (fails for ~5% of users with same structure) var clientData = ["challenge": receivedData.challenge] if let data = data { // Additional data for assertion clientData["account"] = data["account"] clientData["amount"] = data["amount"] } 4. SHA256 Hash Implementation extension Data { public func toSHA256() -> Data { return Data(SHA256.hash(data: self)) } } 5. Key Storage Implementation Using UserDefaults for key storage (works consistently for all users): private let keyStorageTag = "app-attest-keyid" func setKey(_ keyId: String) -> Result<(), KeyStorageError> { UserDefaults.standard.set(keyId, forKey: keyStorageTag) return .success(()) } func getKey() -> Result<String?, KeyStorageError> { let keyId = UserDefaults.standard.string(forKey: keyStorageTag) return .success(keyId) } Questions User-Specific Factors: Since this affects only ~5% of users consistently, could there be device-specific, iOS version-specific, or account-specific factors that cause invalidInput? Key State Validation: Is there any way to validate the state of an attested key before calling generateAssertion()? The key length (44 chars) appears normal for both successful and failing cases. Keychain vs UserDefaults: Could the issue be related to using UserDefaults instead of Keychain for key storage? Though this works for 95% of users. Race Conditions: Could there be subtle race conditions or timing issues that only affect certain users/devices? Error Recovery: Is there a recommended way to handle this error? Should we attempt re-attestation for these users? Additional Context & Debugging Attempts Consistent Failure: Users who experience this error typically experience it on every attempt Key Validation: Both successful and failing users have identical key formats (44 character strings) Device Diversity: Issue observed across different device models and iOS versions Server Logs: Our server successfully provides challenges and processes attestation for all users Re-attestation: Forcing re-attestation sometimes resolves the issue temporarily, but it often recurs The fact that 95% of users succeed with identical code suggests there might be some environmental or device-specific factor that we're not accounting for. Any insights into what could cause invalidInput for a subset of users would be invaluable.
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Jun ’25
Mac App Store app triggers "cannot verify free of malware" alert when opening as default app
My app Mocawave is a music player distributed through the Mac App Store. It declares specific audio document types (public.mp3, com.microsoft.waveform-audio, public.mpeg-4-audio, public.aac-audio) in its CFBundleDocumentTypes with a Viewer role. When a user sets Mocawave as the default app for audio files and double-clicks an MP3 downloaded from the internet (which has the com.apple.quarantine extended attribute), macOS displays the alert: "Apple could not verify [filename] is free of malware that may harm your Mac or compromise your privacy." This does not happen when: Opening the same file via NSOpenPanel from within the app Opening the same file with Apple's Music.app or QuickTime Player The app is: Distributed through the Mac App Store Sandboxed (com.apple.security.app-sandbox) Uses com.apple.security.files.user-selected.read-write entitlement The file being opened is a regular audio file (MP3), not an executable. Since the app is sandboxed and distributed through the App Store, I expected it to have sufficient trust to open quarantined data files without triggering Gatekeeper warnings — similar to how Music.app and QuickTime handle them. Questions: Is there a specific entitlement or Info.plist configuration that allows a sandboxed Mac App Store app to open quarantined audio files without this alert? Is this expected behavior for third-party App Store apps, or could this indicate a misconfiguration on my end? Environment: macOS 15 (Sequoia), app built with Swift/SwiftUI, targeting macOS 13+.
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189
Feb ’26
Critical Privacy and Security Issue: Spotlight disregards explicit exclusions and exposes user files
Apple has repeatedly ignored my reports about a critical privacy issue in Spotlight on macOS 26, and the problem persists in version 26.3 RC. This is not a minor glitch, it is a fundamental breach of user trust and privacy. Several aspects of Spotlight fail to respect user settings: • Hidden apps still exposed: In the Apps section (Cmd+1), Spotlight continues to display apps marked with the hidden flag, even though they should remain invisible. • Clipboard reactivation: The clipboard feature repeatedly turns itself back on after logout or restart, despite being explicitly disabled by the user. • Excluded files revealed: Most concerning, Spotlight exposes files in Suggestions and Recents (Cmd+3) even when those files are explicitly excluded under System Settings > Spotlight > Search Privacy. This behavior directly violates user expectations and system settings. It is not only a major privacy issue but also a security risk, since sensitive files can be surfaced without consent. Apple must address this immediately. Users rely on Spotlight to respect their privacy configurations, and the current behavior undermines both trust and security.
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Feb ’26
com.apple.devicecheck.error - 3: Error Domain=com.apple.devicecheck.error Code=3 "(null)"
Hi, In our app we are using DeviceCheck (App Attest) in a production environment iOS. The service works correctly for most users, but a user reported failure in a flow that use device check service. This failure is not intermittently, it is constant. We are unable to reproduce this failure and we are believing that this failure occurred by new version ios 26.3 because for others users using early versions the service is normally. Environment iOS 26.3 Real device App Attest capability enabled Correct App ID, Team ID and App Attest entitlement Production environment Characteristics: appears constantly affects only unique user -Don't resolves after time or reinstall not reproducible on our test devices NSError contains no additional diagnostic info (Error Domain=com.apple.devicecheck.error Code=3 "(null)") We saw about this error code 3 in this post 812308, but it's not our case because the ios version in this case is not iOS 17.0 or earlier. Please, help us any guidance for solution. Thank you
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Jan ’26
Implementing Password AutoFill on macOS — Looking for Guidance
Hi everyone, I'm currently working on a native macOS app (built with SwiftUI) and I'm trying to implement Password AutoFill functionality so users can use their saved credentials from Keychain or third-party password managers. I've gone through Apple's documentation, WWDC sessions, and sample code, but I've noticed that the resources primarily focus on iOS and web implementations. There's very limited guidance specifically for macOS. I've set up: Associated Domains entitlement with the webcredentials: service The apple-app-site-association file on my server TextField with .textContentType(.username) and SecureField with .textContentType(.password) However, I'm still not seeing the expected AutoFill behavior on macOS like I would on iOS. Has anyone successfully implemented Password AutoFill on a native macOS app? Are there any macOS-specific considerations or additional steps required that differ from iOS? Any guidance, sample code, or pointers to documentation I might have missed would be greatly appreciated.
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425
Dec ’25
Question: Best Practice for Storing API Keys in iOS Apps (RevenueCat, PostHog, AWS Rekognition, etc.)
Hi everyone, I’m looking for clarification on best practices for storing API keys in an iOS app — for example, keys used with RevenueCat, PostHog, AWS Rekognition, barcode scanners, and similar third-party services. I understand that hard-coding API keys directly in the app’s source code is a bad idea, since they can be extracted from the binary. However, using a .plist file doesn’t seem secure either, as it’s still bundled with the app and can be inspected. I’m wondering: What are Apple’s recommended approaches for managing these kinds of keys? Does Xcode Cloud offer a built-in or best-practice method for securely injecting environment variables or secrets at build time? Would using an external service like AWS Secrets Manager or another server-side solution make sense for this use case? Any insights or examples of how others are handling this securely within Apple’s ecosystem would be greatly appreciated. Thanks for considering my questions! — Paul
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Oct ’25
DCAppAttestService errors: com.apple.devicecheck.error 3 and 4
Hello, we are using DeviceCheck – App Attest in a production iOS app. The integration has been live for some time and works correctly for most users, but a small subset of users encounter non-deterministic failures that we are unable to reproduce internally. Environment iOS 14+ Real devices only (no simulator) App Attest capability enabled Correct App ID, Team ID and App Attest entitlement Production environment Relevant code let service = DCAppAttestService.shared service.generateKey { keyId, error in // key generation } service.attestKey(keyId, clientDataHash: hash) { attestation, error in // ERROR: com.apple.devicecheck.error 3 / 4 } service.generateAssertion(keyId, clientDataHash: clientDataHash) { assertion, error in // ERROR: com.apple.devicecheck.error 3 / 4 } For some users we intermittently receive: com.apple.devicecheck.error error 3 com.apple.devicecheck.error error 4 Characteristics: appears random affects only some users/devices sometimes resolves after time or reinstall not reproducible on our test devices NSError contains no additional diagnostic info Some questions: What is the official meaning of App Attest errors 3 and 4? Are these errors related to key state, device conditions, throttling, or transient App Attest service issues? Is there any recommended way to debug or gain more insight when this happens in production? Any guidance would be greatly appreciated, as this impacts real users and is difficult to diagnose. Thank you.
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Feb ’26
Regression: QuickLookAR shares USDZ file instead of source URL on iOS 26
On iOS 26, QuickLookAR (ARQuickLookPreviewItem) shares the actual .usdz file via the system Share Sheet instead of the original website URL. This is a regression from iOS 17–18, where sharing correctly preserved and sent only the source URL. Repro steps: 1. Open a web-hosted USDZ model in QuickLookAR (Safari). 2. Tap Share. 3. Share via any messenger. 4. The full .usdz file is sent. Expected: Share Sheet sends only the original URL. Actual: Share Sheet sends the USDZ file. Impact: Uncontrolled distribution of proprietary 3D assets. Critical IP / data leak. Blocks production AR deployments relying on QuickLook. Environment: iOS 26.0–26.1, iPhone 14 / 15. Works as expected on iOS 17–18. Test case: https://admixreality.com/ios26/
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650
Jan ’26
Unable to change App Tracking configuration
I have reached out to support and they simply tell me they are unable to help me, first redirecting me to generic Apple support, after following up they provided the explanation that they only handle administrative tasks and to post on the forums. I am unable to change my App Tracking Transparency it provides no real error, though network traffic shows a 409 HTTP response from the backend API when trying to save. Here is a screenshot of the result when trying to save. Does anyone have any suggestions on how to get this resolved? I've commented back to the reviewers and they simply provided help documentation. I have a technical issue and am unable to get anyone to help resolve this.
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373
Nov ’25
iOS SMS OTP AutoFill without clicking the keyboard suggestion
Hi Apple, Currently we want to have enhancement for SMS OTP that we want to implement OTP Autofill, But after do some research we're stuck with option that the OTP only show in keyboard suggestion, is there any way for making OTP is automatically filled without user have to click the keyboard suggestion when receiving the SMS. Thanks Best Regards, Admiral Sultano Harly.
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641
Nov ’25
Automatic passkey upgrade not working
Seeing the following error when attempting automatic passkey upgrade - [Warning] NotAllowedError: The request is not allowed by the user agent or the platform in the current context, possibly because the user denied permission. We're trying to enable Automatic passkey upgrade (https://aninterestingwebsite.com/videos/play/wwdc2024/10125/?time=38) for our website but it's not working from our testing on iOS 18.2 and 18.3 Beta Safari. The flow on our website looks like: the customers use autofill to fill out email and password on the sign-in page (abc.com/signin) PublicKeyCredential.getClientCapabilities is called to check if conditionalCreate supported. land on another page of our website (abc.com/pageX), which calls navigator.credentials.create with mediation conditional (Right after sign-in). We checked that we followed the steps in above video: Allow automatic passkey upgrades is enabled, mediation is set to conditional and password autofill is used to signed in. However, Safari threw an error [Warning] NotAllowedError: The request is not allowed by the user agent or the platform in the current context, possibly because the user denied permission. Can Apple help guide us if anything is missed here?
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Apr ’25
Custom Authorization Plugin in Login Flow
What Has Been Implemented Replaced the default loginwindow:login with a custom authorization plugin. The plugin: Performs primary OTP authentication. Displays a custom password prompt. Validates the password using Open Directory (OD) APIs. Next Scenario was handling password change Password change is simulated via: sudo pwpolicy -u robo -setpolicy "newPasswordRequired=1" On next login: Plugin retrieves the old password. OD API returns kODErrorCredentialsPasswordChangeRequired. Triggers a custom change password window to collect and set new password. Issue Observed : After changing password: The user’s login keychain resets. Custom entries under the login keychain are removed. We have tried few solutions Using API, SecKeychainChangePassword(...) Using CLI, security set-keychain-password -o oldpwd -p newpwd ~/Library/Keychains/login.keychain-db These approaches appear to successfully change the keychain password, but: On launching Keychain Access, two password prompts appear, after authentication, Keychain Access window doesn't appear (no app visibility). Question: Is there a reliable way (API or CLI) to reset or update the user’s login keychain password from within the custom authorization plugin, so: The keychain is not reset or lost. Keychain Access works normally post-login. The password update experience is seamless. Thank you for your help and I appreciate your time and consideration
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Jun ’25
Transfer an application between accounts with an existing App Group
Due to business requirements, we need to transfer our app Gem Space for iOS from our current Apple Developer account to a new account. We have a major concern regarding our users and the data associated with the app. The user data is currently stored using an App Group with the identifier, for example: "group.com.app.sharedData" According to some information we’ve found, it might be possible to complete the transfer by removing the App Group from the old account and creating a new one with the same identifier in the new account. However, other sources suggest that App Group containers are owned by the specific team, and data stored in the container may become inaccessible after the app is transferred to a different team. This raises concerns about the possibility of users losing access to their data after updating the app from the new account. Could you please clarify the expected behavior of App Groups in this case? Do we need to perform any kind of data migration, and if so, could you please provide detailed guidance on how to do it safely and without impacting user data access?
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Apr ’25
Permission requirements for LAContext's canEvaluatePolicy
Hi, I am developing an app that checks if biometric authentication capabilities (Face ID and Touch ID) are available on a device. I have a few questions: Do I need to include a privacy string in my app to use the LAContext's canEvaluatePolicy function? This function checks if biometric authentication is available on the device, but does not actually trigger the authentication. From my testing, it seems like a privacy declaration is only required when using LAContext's evaluatePolicy function, which would trigger the biometric authentication. Can you confirm if this is the expected behavior across all iOS versions and iPhone models? When exactly does the biometric authentication permission pop-up appear for users - is it when calling canEvaluatePolicy or evaluatePolicy? I want to ensure my users have a seamless experience. Please let me know if you have any insights on these questions. I want to make sure I'm handling the biometric authentication functionality correctly in my app. Thank you!
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Jun ’25
Is “webcredentials” required for HTTPS callbacks in ASWebAuthenticationSession?
Hello, When using ASWebAuthenticationSession with an HTTPS callback URL (Universal Link), I receive the following error: Authorization error: The operation couldn't be completed. Application with identifier jp.xxxx.yyyy.dev is not associated with domain xxxx-example.go.link. Using HTTPS callbacks requires Associated Domains using the webcredentials service type for xxxx-example.go.link. I checked Apple’s official documentation but couldn’t find any clear statement that webcredentials is required when using HTTPS callbacks in ASWebAuthenticationSession. What I’d like to confirm: Is webcredentials officially required when using HTTPS as a callback URL with ASWebAuthenticationSession? If so, is there any official documentation or technical note that states this requirement? Environment iOS 18.6.2 Xcode 16.4 Any clarification or official references would be greatly appreciated. Thank you.
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Nov ’25
Using provision profile to access assessments triggers a keychain popup
Hello! I do know apple does not support electron, but I do not think this is an electron related issue, rather something I am doing wrong. I'd be curious to find out why the keychain login is happenning after my app has been signed with the bundleid, entitlements, and provision profile. Before using the provision profile I did not have this issue, but it is needed for assessments feature. I'm trying to ship an Electron / macOS desktop app that must run inside Automatic Assessment Configuration. The build signs and notarizes successfully, and assessment mode itself starts on Apple-arm64 machines, but every single launch shows the system dialog that asks to allow access to the "login" keychain. The dialog appears on totally fresh user accounts, so it's not tied to anything I store there. It has happened ever since I have added the provision profile to the electron builder to finally test assessment out. entitlements.inherit.plist keys &lt;key&gt;com.apple.security.cs.allow-jit&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.cs.allow-unsigned-executable-memory&lt;/key&gt; &lt;true/&gt; entitlements.plist keys: &lt;key&gt;com.apple.security.cs.allow-jit&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.cs.allow-unsigned-executable-memory&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.developer.automatic-assessment-configuration&lt;/key&gt; &lt;true/&gt; I'm honestly not sure whether the keychain is expected, but I have tried a lot of entitlement combinations to get rid of It. Electron builder is doing the signing, and we manually use the notary tool to notarize but probably irrelevant. mac: { notarize: false, target: 'dir', entitlements: 'buildResources/entitlements.mac.plist', provisioningProfile: 'buildResources/xyu.provisionprofile', entitlementsInherit: 'buildResources/entitlements.mac.inherit.plist', Any lead is welcome!
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Jun ’25
When is the kTCCServiceEndpointSecurityClient permission set by macOS?
[Q] When is the kTCCServiceEndpointSecurityClient set by macOS and in which conditions? From what I'm gathering, the kTCCServiceEndpointSecurityClient can not be set by a configuration profile and the end user can only grant full disk access. I searched for documentation on Apple's develop website (with the "kTCCServiceEndpointSecurityClient" search) and did not get any useful result. Using a more complete search engine, or the forum search engine, only points to the old annoying big bug in macOS Ventura. The problem I'm investigating is showing a process being listed as getting granted kTCCServiceEndpointSecurityClient permissions in the TCC database when: it's not an Endpoint Security client. it does not have the ES Client entitlement. the bundle of the process includes another process that is an ES Client and is spawn-ed by this process but I don't see why this should have an impact. This process is supposed to have been granted kTCCServiceSystemPolicyAllFiles via end user interaction or configuration profile. AFAIK, the kTCCServiceEndpointSecurityClient permission can only be set by macOS itself. So this looks like to be either a bug in macOS, an undocumented behavior or I'm missing something. Hence the initial question. macOS 15.7.3 / Apple Silicon
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138
Activity
Feb ’26
DCError.invalidInput on generateAssertion() - Affecting Small Subset of Users
Issue Summary I'm encountering a DCError.invalidInput error when calling DCAppAttestService.shared.generateAssertion() in my App Attest implementation. This issue affects only a small subset of users - the majority of users can successfully complete both attestation and assertion flows without any issues. According to Apple Engineer feedback, there might be a small implementation issue in my code. Key Observations Success Rate: ~95% of users complete the flow successfully Failure Pattern: The remaining ~5% consistently fail at assertion generation Key Length: Logs show key length of 44 characters for both successful and failing cases Consistency: Users who experience the error tend to experience it consistently Platform: Issue observed across different iOS versions and device types Environment iOS App Attest implementation Using DCAppAttestService for both attestation and assertion Custom relying party server communication Issue affects ~5% of users consistently Key Implementation Details 1. Attestation Flow (Working) The attestation process works correctly: // Generate key and attest (successful for all users) self.attestService.generateKey { keyId, keyIdError in guard keyIdError == nil, let keyId = keyId else { return completionHandler(.failure(.dcError(keyIdError as! DCError))) } // Note: keyId length is consistently 44 characters for both successful and failing users // Attest key with Apple servers self.attestKey(keyId, clientData: clientData) { result in // ... verification with RP server // Key is successfully stored for ALL users (including those who later fail at assertion) } } 2. Assertion Flow (Failing for ~5% of Users with invalidInput) The assertion generation fails for a consistent subset of users: // Get assertion data from RP server self.assertRelyingParty.getAssertionData(kid, with: data) { result in switch result { case .success(let receivedData): let session = receivedData.session let clientData = receivedData.clientData let hash = clientData.toSHA256() // SHA256 hash of client data // THIS CALL FAILS WITH invalidInput for ~5% of users // Same keyId (44 chars) that worked for attestation self.attestService.generateAssertion(kid, clientDataHash: hash) { assertion, err in guard err == nil, let assertion = assertion else { // Error: DCError.invalidInput if let err = err as? DCError, err.code == .invalidKey { return reattestAndAssert(.invalidKey, completionHandler) } else { return completionHandler(.failure(.dcError(err as! DCError))) } } // ... verification logic } } } 3. Client Data Structure Client data JSON structure (identical for successful and failing users): // For attestation (works for all users) let clientData = ["challenge": receivedData.challenge] // For assertion (fails for ~5% of users with same structure) var clientData = ["challenge": receivedData.challenge] if let data = data { // Additional data for assertion clientData["account"] = data["account"] clientData["amount"] = data["amount"] } 4. SHA256 Hash Implementation extension Data { public func toSHA256() -> Data { return Data(SHA256.hash(data: self)) } } 5. Key Storage Implementation Using UserDefaults for key storage (works consistently for all users): private let keyStorageTag = "app-attest-keyid" func setKey(_ keyId: String) -> Result<(), KeyStorageError> { UserDefaults.standard.set(keyId, forKey: keyStorageTag) return .success(()) } func getKey() -> Result<String?, KeyStorageError> { let keyId = UserDefaults.standard.string(forKey: keyStorageTag) return .success(keyId) } Questions User-Specific Factors: Since this affects only ~5% of users consistently, could there be device-specific, iOS version-specific, or account-specific factors that cause invalidInput? Key State Validation: Is there any way to validate the state of an attested key before calling generateAssertion()? The key length (44 chars) appears normal for both successful and failing cases. Keychain vs UserDefaults: Could the issue be related to using UserDefaults instead of Keychain for key storage? Though this works for 95% of users. Race Conditions: Could there be subtle race conditions or timing issues that only affect certain users/devices? Error Recovery: Is there a recommended way to handle this error? Should we attempt re-attestation for these users? Additional Context & Debugging Attempts Consistent Failure: Users who experience this error typically experience it on every attempt Key Validation: Both successful and failing users have identical key formats (44 character strings) Device Diversity: Issue observed across different device models and iOS versions Server Logs: Our server successfully provides challenges and processes attestation for all users Re-attestation: Forcing re-attestation sometimes resolves the issue temporarily, but it often recurs The fact that 95% of users succeed with identical code suggests there might be some environmental or device-specific factor that we're not accounting for. Any insights into what could cause invalidInput for a subset of users would be invaluable.
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390
Activity
Jun ’25
Mac App Store app triggers "cannot verify free of malware" alert when opening as default app
My app Mocawave is a music player distributed through the Mac App Store. It declares specific audio document types (public.mp3, com.microsoft.waveform-audio, public.mpeg-4-audio, public.aac-audio) in its CFBundleDocumentTypes with a Viewer role. When a user sets Mocawave as the default app for audio files and double-clicks an MP3 downloaded from the internet (which has the com.apple.quarantine extended attribute), macOS displays the alert: "Apple could not verify [filename] is free of malware that may harm your Mac or compromise your privacy." This does not happen when: Opening the same file via NSOpenPanel from within the app Opening the same file with Apple's Music.app or QuickTime Player The app is: Distributed through the Mac App Store Sandboxed (com.apple.security.app-sandbox) Uses com.apple.security.files.user-selected.read-write entitlement The file being opened is a regular audio file (MP3), not an executable. Since the app is sandboxed and distributed through the App Store, I expected it to have sufficient trust to open quarantined data files without triggering Gatekeeper warnings — similar to how Music.app and QuickTime handle them. Questions: Is there a specific entitlement or Info.plist configuration that allows a sandboxed Mac App Store app to open quarantined audio files without this alert? Is this expected behavior for third-party App Store apps, or could this indicate a misconfiguration on my end? Environment: macOS 15 (Sequoia), app built with Swift/SwiftUI, targeting macOS 13+.
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189
Activity
Feb ’26
Critical Privacy and Security Issue: Spotlight disregards explicit exclusions and exposes user files
Apple has repeatedly ignored my reports about a critical privacy issue in Spotlight on macOS 26, and the problem persists in version 26.3 RC. This is not a minor glitch, it is a fundamental breach of user trust and privacy. Several aspects of Spotlight fail to respect user settings: • Hidden apps still exposed: In the Apps section (Cmd+1), Spotlight continues to display apps marked with the hidden flag, even though they should remain invisible. • Clipboard reactivation: The clipboard feature repeatedly turns itself back on after logout or restart, despite being explicitly disabled by the user. • Excluded files revealed: Most concerning, Spotlight exposes files in Suggestions and Recents (Cmd+3) even when those files are explicitly excluded under System Settings > Spotlight > Search Privacy. This behavior directly violates user expectations and system settings. It is not only a major privacy issue but also a security risk, since sensitive files can be surfaced without consent. Apple must address this immediately. Users rely on Spotlight to respect their privacy configurations, and the current behavior undermines both trust and security.
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2
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0
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501
Activity
Feb ’26
Sample code from "Secure your app with Memory Integrity Enforcement"
Hello, Thanks for the new video on Memory Integrity Enforcement! Is the presented app's sample code available (so that we can play with it and find & fix the bug on our own, using Soft Mode)? Thanks in advance!
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2
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0
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572
Activity
Oct ’25
com.apple.devicecheck.error - 3: Error Domain=com.apple.devicecheck.error Code=3 "(null)"
Hi, In our app we are using DeviceCheck (App Attest) in a production environment iOS. The service works correctly for most users, but a user reported failure in a flow that use device check service. This failure is not intermittently, it is constant. We are unable to reproduce this failure and we are believing that this failure occurred by new version ios 26.3 because for others users using early versions the service is normally. Environment iOS 26.3 Real device App Attest capability enabled Correct App ID, Team ID and App Attest entitlement Production environment Characteristics: appears constantly affects only unique user -Don't resolves after time or reinstall not reproducible on our test devices NSError contains no additional diagnostic info (Error Domain=com.apple.devicecheck.error Code=3 "(null)") We saw about this error code 3 in this post 812308, but it's not our case because the ios version in this case is not iOS 17.0 or earlier. Please, help us any guidance for solution. Thank you
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2
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1
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761
Activity
Jan ’26
Implementing Password AutoFill on macOS — Looking for Guidance
Hi everyone, I'm currently working on a native macOS app (built with SwiftUI) and I'm trying to implement Password AutoFill functionality so users can use their saved credentials from Keychain or third-party password managers. I've gone through Apple's documentation, WWDC sessions, and sample code, but I've noticed that the resources primarily focus on iOS and web implementations. There's very limited guidance specifically for macOS. I've set up: Associated Domains entitlement with the webcredentials: service The apple-app-site-association file on my server TextField with .textContentType(.username) and SecureField with .textContentType(.password) However, I'm still not seeing the expected AutoFill behavior on macOS like I would on iOS. Has anyone successfully implemented Password AutoFill on a native macOS app? Are there any macOS-specific considerations or additional steps required that differ from iOS? Any guidance, sample code, or pointers to documentation I might have missed would be greatly appreciated.
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2
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425
Activity
Dec ’25
Question: Best Practice for Storing API Keys in iOS Apps (RevenueCat, PostHog, AWS Rekognition, etc.)
Hi everyone, I’m looking for clarification on best practices for storing API keys in an iOS app — for example, keys used with RevenueCat, PostHog, AWS Rekognition, barcode scanners, and similar third-party services. I understand that hard-coding API keys directly in the app’s source code is a bad idea, since they can be extracted from the binary. However, using a .plist file doesn’t seem secure either, as it’s still bundled with the app and can be inspected. I’m wondering: What are Apple’s recommended approaches for managing these kinds of keys? Does Xcode Cloud offer a built-in or best-practice method for securely injecting environment variables or secrets at build time? Would using an external service like AWS Secrets Manager or another server-side solution make sense for this use case? Any insights or examples of how others are handling this securely within Apple’s ecosystem would be greatly appreciated. Thanks for considering my questions! — Paul
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487
Activity
Oct ’25
DCAppAttestService errors: com.apple.devicecheck.error 3 and 4
Hello, we are using DeviceCheck – App Attest in a production iOS app. The integration has been live for some time and works correctly for most users, but a small subset of users encounter non-deterministic failures that we are unable to reproduce internally. Environment iOS 14+ Real devices only (no simulator) App Attest capability enabled Correct App ID, Team ID and App Attest entitlement Production environment Relevant code let service = DCAppAttestService.shared service.generateKey { keyId, error in // key generation } service.attestKey(keyId, clientDataHash: hash) { attestation, error in // ERROR: com.apple.devicecheck.error 3 / 4 } service.generateAssertion(keyId, clientDataHash: clientDataHash) { assertion, error in // ERROR: com.apple.devicecheck.error 3 / 4 } For some users we intermittently receive: com.apple.devicecheck.error error 3 com.apple.devicecheck.error error 4 Characteristics: appears random affects only some users/devices sometimes resolves after time or reinstall not reproducible on our test devices NSError contains no additional diagnostic info Some questions: What is the official meaning of App Attest errors 3 and 4? Are these errors related to key state, device conditions, throttling, or transient App Attest service issues? Is there any recommended way to debug or gain more insight when this happens in production? Any guidance would be greatly appreciated, as this impacts real users and is difficult to diagnose. Thank you.
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2
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2
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412
Activity
Feb ’26
Regression: QuickLookAR shares USDZ file instead of source URL on iOS 26
On iOS 26, QuickLookAR (ARQuickLookPreviewItem) shares the actual .usdz file via the system Share Sheet instead of the original website URL. This is a regression from iOS 17–18, where sharing correctly preserved and sent only the source URL. Repro steps: 1. Open a web-hosted USDZ model in QuickLookAR (Safari). 2. Tap Share. 3. Share via any messenger. 4. The full .usdz file is sent. Expected: Share Sheet sends only the original URL. Actual: Share Sheet sends the USDZ file. Impact: Uncontrolled distribution of proprietary 3D assets. Critical IP / data leak. Blocks production AR deployments relying on QuickLook. Environment: iOS 26.0–26.1, iPhone 14 / 15. Works as expected on iOS 17–18. Test case: https://admixreality.com/ios26/
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2
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0
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650
Activity
Jan ’26
Unable to change App Tracking configuration
I have reached out to support and they simply tell me they are unable to help me, first redirecting me to generic Apple support, after following up they provided the explanation that they only handle administrative tasks and to post on the forums. I am unable to change my App Tracking Transparency it provides no real error, though network traffic shows a 409 HTTP response from the backend API when trying to save. Here is a screenshot of the result when trying to save. Does anyone have any suggestions on how to get this resolved? I've commented back to the reviewers and they simply provided help documentation. I have a technical issue and am unable to get anyone to help resolve this.
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2
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0
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373
Activity
Nov ’25
DCDevice.current.generateToken : return Error Missing or incorrectly formatted device token payload
we can get token but when send to verity from apple. it reture Error : {"responseCode":"400","responseMessage":"Missing or incorrectly formatted device token payload"}
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2
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1
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240
Activity
Jun ’25
iOS SMS OTP AutoFill without clicking the keyboard suggestion
Hi Apple, Currently we want to have enhancement for SMS OTP that we want to implement OTP Autofill, But after do some research we're stuck with option that the OTP only show in keyboard suggestion, is there any way for making OTP is automatically filled without user have to click the keyboard suggestion when receiving the SMS. Thanks Best Regards, Admiral Sultano Harly.
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2
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2
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641
Activity
Nov ’25
Automatic passkey upgrade not working
Seeing the following error when attempting automatic passkey upgrade - [Warning] NotAllowedError: The request is not allowed by the user agent or the platform in the current context, possibly because the user denied permission. We're trying to enable Automatic passkey upgrade (https://aninterestingwebsite.com/videos/play/wwdc2024/10125/?time=38) for our website but it's not working from our testing on iOS 18.2 and 18.3 Beta Safari. The flow on our website looks like: the customers use autofill to fill out email and password on the sign-in page (abc.com/signin) PublicKeyCredential.getClientCapabilities is called to check if conditionalCreate supported. land on another page of our website (abc.com/pageX), which calls navigator.credentials.create with mediation conditional (Right after sign-in). We checked that we followed the steps in above video: Allow automatic passkey upgrades is enabled, mediation is set to conditional and password autofill is used to signed in. However, Safari threw an error [Warning] NotAllowedError: The request is not allowed by the user agent or the platform in the current context, possibly because the user denied permission. Can Apple help guide us if anything is missed here?
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2
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1
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750
Activity
Apr ’25
Custom Authorization Plugin in Login Flow
What Has Been Implemented Replaced the default loginwindow:login with a custom authorization plugin. The plugin: Performs primary OTP authentication. Displays a custom password prompt. Validates the password using Open Directory (OD) APIs. Next Scenario was handling password change Password change is simulated via: sudo pwpolicy -u robo -setpolicy "newPasswordRequired=1" On next login: Plugin retrieves the old password. OD API returns kODErrorCredentialsPasswordChangeRequired. Triggers a custom change password window to collect and set new password. Issue Observed : After changing password: The user’s login keychain resets. Custom entries under the login keychain are removed. We have tried few solutions Using API, SecKeychainChangePassword(...) Using CLI, security set-keychain-password -o oldpwd -p newpwd ~/Library/Keychains/login.keychain-db These approaches appear to successfully change the keychain password, but: On launching Keychain Access, two password prompts appear, after authentication, Keychain Access window doesn't appear (no app visibility). Question: Is there a reliable way (API or CLI) to reset or update the user’s login keychain password from within the custom authorization plugin, so: The keychain is not reset or lost. Keychain Access works normally post-login. The password update experience is seamless. Thank you for your help and I appreciate your time and consideration
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2
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333
Activity
Jun ’25
Transfer an application between accounts with an existing App Group
Due to business requirements, we need to transfer our app Gem Space for iOS from our current Apple Developer account to a new account. We have a major concern regarding our users and the data associated with the app. The user data is currently stored using an App Group with the identifier, for example: "group.com.app.sharedData" According to some information we’ve found, it might be possible to complete the transfer by removing the App Group from the old account and creating a new one with the same identifier in the new account. However, other sources suggest that App Group containers are owned by the specific team, and data stored in the container may become inaccessible after the app is transferred to a different team. This raises concerns about the possibility of users losing access to their data after updating the app from the new account. Could you please clarify the expected behavior of App Groups in this case? Do we need to perform any kind of data migration, and if so, could you please provide detailed guidance on how to do it safely and without impacting user data access?
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2
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99
Activity
Apr ’25
Permission requirements for LAContext's canEvaluatePolicy
Hi, I am developing an app that checks if biometric authentication capabilities (Face ID and Touch ID) are available on a device. I have a few questions: Do I need to include a privacy string in my app to use the LAContext's canEvaluatePolicy function? This function checks if biometric authentication is available on the device, but does not actually trigger the authentication. From my testing, it seems like a privacy declaration is only required when using LAContext's evaluatePolicy function, which would trigger the biometric authentication. Can you confirm if this is the expected behavior across all iOS versions and iPhone models? When exactly does the biometric authentication permission pop-up appear for users - is it when calling canEvaluatePolicy or evaluatePolicy? I want to ensure my users have a seamless experience. Please let me know if you have any insights on these questions. I want to make sure I'm handling the biometric authentication functionality correctly in my app. Thank you!
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2
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170
Activity
Jun ’25
Is “webcredentials” required for HTTPS callbacks in ASWebAuthenticationSession?
Hello, When using ASWebAuthenticationSession with an HTTPS callback URL (Universal Link), I receive the following error: Authorization error: The operation couldn't be completed. Application with identifier jp.xxxx.yyyy.dev is not associated with domain xxxx-example.go.link. Using HTTPS callbacks requires Associated Domains using the webcredentials service type for xxxx-example.go.link. I checked Apple’s official documentation but couldn’t find any clear statement that webcredentials is required when using HTTPS callbacks in ASWebAuthenticationSession. What I’d like to confirm: Is webcredentials officially required when using HTTPS as a callback URL with ASWebAuthenticationSession? If so, is there any official documentation or technical note that states this requirement? Environment iOS 18.6.2 Xcode 16.4 Any clarification or official references would be greatly appreciated. Thank you.
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2
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280
Activity
Nov ’25
Is there a way for MDM to push a unique mTLS certificate w/ our Application?
Hi, It may be a stupid question, but we really wonder if there is a way for MDM to push a unique mTLS cert to our iOS application or if it can populate a client certificate in the iOS where our application can access it. Like browser app, how do browser mTLS certs get pushed? Thanks, Ying
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2
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827
Activity
Apr ’25