Did you published your game in Play Store if so and you enabled Google's apk signing then the sha1 certificate would have been changed so in this case you have open your project in Google cloud platform (Google APIs)and copy the new signature by Google from play console section and paste it in Google APIs and save your project and wait for few minutes. This should work. ;)
I just want to chime in here and say that this worked for a similar issue that I had. Thank you for this bit of info -- you saved my game! Check out Rap Quest 2 v 2.0.0 when it's out in a few weeks!!!!