Error: Status{statusCode=DEVELOPER_ERROR, resolution=null}

You need to add your SHA1 key to firebase console configuration. You can do it in this way:

Firebase console ( https://console.firebase.google.com ) -> your project -> configuration -> scroll to

You can find your SHA1 key running "Signing report" from Android Studio:

Then, look the "run tab" and click the button:

I think it's the easier way. Hope this help.

Probably you created the configuration file using the SHA1 of your production token, use the androiddebugkey alias to gather the SHA1 corresponding to the debug version of your app and copy the configuration file to the 'app' directory, you should have both configuration files (one for debug purposes and another for production environment).

Based on the walkthrough published in https://developers.google.com/identity/sign-in/android/start

I had the same issue and I got it working by doing these steps:

1.Add DEBUG_KEYSTORE SHA1 fingerprint to the firebase project. use the following command(MAC/LINUX)

  keytool -exportcert -list -v \-alias androiddebugkey -keystore ~/.android/debug.keystore  

2.Now Generate a signed apk of your project. The process includes generating a keystore for your app's release version.

  Copy the path of the newly generated .jks file.

3.Now generate RELEASE_KEYSTORE SHA1 fingerprint using the following command

  keytool -list -v -keystore FULL_PATH_TOJKS_FILE -alias ALIAS_NAME

4.Copy the new SHA1 from the output and add it as another SHA1 fingerprint in your firebase application console.

Now you are good to go! ---- Hope! it helps.