As title says, I encounter this problem. Documentation says to do this:
<meta-data android:name="com.google.android.gms.APP_ID"
android:value="@string/app_id" />
I had done and my app_id is 12 digits. Other people getting this similar error was their app_id s were more than 12 digits. But mine is 12. However, it does not work, I cant sign in. Error also says check your manifest. I have checked and it is the same as above. Why is application id ,which i got it from google play console, not associated with my package name? Do i have to do something with sha1 key? (I am now in th alpha test)
Regards
I also received this error and fixed it by adding one of my tester accounts to the Google Play Services list of testers for the app.
The account I had on the tablet was not in the list of permitted tester accounts in the Google Play Console.
Once I had done this, I was able to connect with no issues.
For reference my app_id entry looks like this :-
<meta-data
android:name="com.google.android.gms.games.APP_ID"
android:value="@string/app_id"/>
you must also check that users gmail id is added in testing or not ? if not then add it to Play Console -> Game Services -> Testing
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