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Based on the information provided, it appears that you're experiencing an unexpected sign-out issue with AWS Amplify in your iOS app after using AWS SNS or SES services. This problem seems to persist even after app termination and relaunch, despite your efforts to manage authentication states and token refreshing.
The error message you're seeing indicates that there is no signed-in user when you try to fetch the session after relaunching the app. This suggests that the user's authentication state is not being properly persisted or restored between app sessions.
Here are some potential reasons and solutions to consider:
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Token Persistence: Ensure that Amplify is configured to persist authentication tokens locally. Check your Amplify configuration to make sure token persistence is enabled.
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Keychain Issues: On iOS, Amplify typically uses the device's Keychain to store authentication information. There might be an issue with Keychain access or data storage. Verify that your app has the necessary Keychain entitlements and that there are no restrictions preventing Amplify from accessing the Keychain.
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Amplify Version: Ensure you're using the latest version of Amplify libraries. There might have been bug fixes or improvements related to authentication state management in newer versions.
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Auth State Listener: While you mentioned implementing a centralized auth management system using Amplify.Hub.listen(to: .auth), double-check that it's correctly set up to handle all possible auth state changes, including those that might occur during background app states.
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AWS SDK Conflicts: If you're using the AWS SDK directly for SNS and SES alongside Amplify, there might be conflicts in how credentials are managed. Ensure that you're using consistent authentication methods across your app.
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Global Sign-Out: Check if there's any unintended global sign-out occurring. A global sign-out invalidates all refresh tokens issued to a user across all devices.
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Session Duration: Verify the session duration settings in your Cognito User Pool. If the session duration is set too short, it might cause unexpected logouts.
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Error Handling: Implement more comprehensive error handling around authentication operations, especially when the app returns to the foreground or launches. This might help identify the exact point where the authentication state is lost.
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Logging: Implement detailed logging for authentication states, token refreshes, and AWS service calls to help pinpoint where the issue occurs.
If none of these suggestions resolve the issue, you may need to reach out to AWS Support for more in-depth troubleshooting, as this behavior seems unusual given the robust nature of Amplify's authentication management.
Sources
Sign-out - AWS Amplify Gen 2 Documentation
Sign-out - AWS Amplify Gen 2 Documentation
Sign-out - AWS Amplify Gen 2 Documentation
Sign-out - AWS Amplify Gen 2 Documentation
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