Firebase OTP working fine on debug apk but not release apk

Question

I am using flutter and firebase OTP. The SMS is received while running the debug APK of my app. However, I am getting this message while running the release APK using the command flutter run --release .

This is the returned message:

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. [ A safety_net_token was passed, but no matching SHA-256 was registered in the Firebase console. Please make sure that this application's packageName/SHA256 pair is registered in the Firebase Console. ]

Kindly note that I am running this app directly on my phone and not by installing it from google play.

I tried the following on firebase console:

1. Debug keys
2. Release Keys
3. Google Play signing and upload keys certificates.
4. Also my google-services.json is up-to-date.
5. Flutter clean and pub get before running in order to make sure that the changes will occur.

I tried all the solutions presented by similar questions such as adding an email in firebase, adding google play keys, etc. and unfortunately none of them worked.

Update : Solved, the problem was wrong naming inside the manifest file as the error message stated:
Please make sure that this application's "packageName/SHA256" pair is registered in the Firebase Console. Usually, it is the sha1 or sha256 keys, however this time it was the package name.

Answer 1

您必须为发布构建生成 SHA-1，并将其添加到您已注册的同一项目的 firebase 控制台。

Answer 2

You need to add SHA Keys in firebase console, to get SHA KEY

• Open Android Studio
• Open Project
• Reveal android folder
• Right click "gradlew" file and select Open in Terminal
• Go to the terminal view and paste: gradlew signingReport

You will find the SHA-1 fingerprint in the "Gradle Console"

Add this SHA-1 fingerprint in firebase console and test again