Google Play Games Login Fails
Solution 1:
Your app id should just be the number and not have "apps.googleusercontent.com" attached to it.
Update: This seems to be related to not having a test account set up
See this question - Google Play Game Services - unable to sign in
Solution 2:
The most likely cause of this problem is a mismatch between the client ID you registered in the Developer Console and your application's signing certificate. In order for sign-in to succeed, the package name and the certificate fingerprint you registered in your client ID should exactly match the package name and signing certificate of your application.
A common mistake is registering the release certificate's SHA1 fingerprint on developer console and then trying to sign the app with the debug certificate. Another common mistake is registering the wrong package name in the developer console.
Also, due to caching, sometimes editing an correcting an existing client ID might not solve the problem immediately. So, if you don't mind switching to a different package name, you might want to try creating a new project with a new package name.
A list of the most common setup issues can be found in our troubleshooting guide:
http://developers.google.com/games/services/android/troubleshooting
Solution 3:
in my case: enable in firebase Google authentification method., it's work for me
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