1.First on you play console under game services setup your game with correct package name and signature and verify.
2.Then go under testing section and add a tester by default your mail-id will be set only with that mail-id you can login into play games.
3.Build a signed apk with same signature and test it on your android smartphone.
Also make sure you correctly used the Google Play in event section in construct3 you've to di the sign-in on start of layout
it says Authorization Error
Error 400: invalid_request
Storagerelay URI is not allowed for 'NATIVE_ANDROID' client type.
and on google game experience i got everything right OAuth 2.0 and Client Status published also the the App ID 100% the same and double checked it and still i get this error