This app is not authorized to use Firebase Authentication.Please verify that the correct package name and SHA-1 are configured in the Firebase Console

Question

Firebase auth was working fine, the debug build suddenly started failing without any change of code, logging the folloing message

D/PhoneAuthActivity( 7392): signInWithCredential:failure:com.google.firebase.auth.FirebaseAuthException: This app is not authorized to use Firebase Authentication. Please verifythat the correct package name and SHA-1 are configured in the Firebase Console. [ App validation failed ].

The only notable action inbetween a successful login and failure is android studio upgrade.

Answer 1

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UPDATE (12th May 2022):

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• Find SHA1 and SHA-256 BOTH the certificate fingerprints from the play store console.

Play store Console > Your project > Release > Setup > App integrity

• Place BOTH SHA1 and SHA-256 fingerprints to your firebase app one by one.

Firebase Console > Your project > Settings of the app > Add Fingerprint

Ref: Authenticating Client Using Play App Signing

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TAKE CARE BELOW POINTS

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1. Also insert local SHA1 and SHA-256. Get it by ./gradlew signingReport . Get more info from here.
2. If you are using an Emulator for phone OTP verification, it won't work since it does not have a sim. So try installing it on your mobile(with sim).
3. Enable app verification step is followed properly. and Android Device Verification is ENABLED.
4. Make sure the correct project is selected from drop-down while enabling Android Device Verification.
5. BOTH SHA-1 and SHA-256 fingerprints to be added in the Firebase project.
6. After doing all the stuff, Please make sure you are using the latest/updated google-services.json file.

Answer 2

When you updated Android Studio, the debug key which is used to sign debug apps might have changed. Just add the new SHA-1 checksum of your debug key in the firebase console.

Easiest way would be to connect/sync to firebase from

Tools>Firebase>Authentication>Connect>Sync

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If you want to do it manually or for release keystore, first generate SHA-1 checksum using following command:

keytool -list -v -keystore KEYSTORE_PATH -alias ALIAS_NAME

Then copy the SHA-1 checksum and go to:

Firebase Console > Your project > Settings of the app > Add Fingerprint

For more info, read this guide: Authenticating Your Client | Google APIs for Android

Answer 3

If you are using a Emulator for phone OTP verification it won't work since it does not have a sim. So try installing it to your mobile(with sim) and check if the error persists.