Why Is My App Getting \'This App Is Not Authorized to Use Firebase Authentication\' Error During a Debug Build?

Troubleshooting "This App is Not Authorized to Use Firebase Authentication"

In the context of using Firebase Authentication, an error message alleging that the app lacks authorization has surfaced. This issue was encountered mysteriously during a debug build, despite previous successful authentication.

The probable cause of this issue lies in the potentially incorrect configuration of package name and SHA-1 details within the Firebase Console. To remedy this, it's crucial to ensure the following steps are undertaken:

1. Verify Package Name: Confirm that the package name used in the code matches the package name registered in the Firebase Console.
2. Update SHA-1 and SHA-256 Fingerprints: Obtain the SHA-1 and SHA-256 fingerprints both from the Play Store Console and from your local development environment using a command like ./gradlew signingReport. Ensure that both fingerprints are added to the associated Firebase project under "Firebase Console > Settings > Add Fingerprint."

Important Notes:

• For accurate phone OTP verification, the app should be installed on a mobile device with a valid SIM card. Emulators may not be suitable for this purpose.
• Ensure that the "Android Device Verification" feature is enabled within the Firebase Console.
• Confirm that the correct project is selected when enabling device verification.
• After updating these details, obtain the latest google-services.json file and incorporate it into your project.

By meticulously following these steps, you can effectively resolve the authorization issue and restore seamless Firebase Authentication functionality within your app.

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