ApiException on silent signing using GoogleSignInClient on Android

Question

I get following error frequently when I try to sign in silently on android. How can I debug this. What is the reason for this. (I have an active google account on my android

Answer 1

That error happened to me because I haven't added the email I was testing with to the Testers tab in Google Play Games Console.

I believe it also occurs if your build hasn't been signed with the same SHA1 key that your google play games app id was generated with