Google Play app signing not working

I curiously turned on Subscription Signing in our app, and I found that the problems it created are bigger than it kept ...

First I need to go to Google API to manually change the Signature Fingerprint as said in here , and I need to uninstall and install again every time I want to switch between testing and published build because the signature is different.

The most annoying thing is that I can't test Game Services in my test build! It always failed on authentication. I have to upload it to beta, update from Google Play so the signature is correct and can enter:

SignInFailureReason(serviceErrorCode:SIGN_IN_REQUIRED(4),activityResultCode:SIGN_IN_FAILED)

      

        
        
        
      

    

I have already added SHA1 to load the keystore, but that doesn't help ...

Is there a way to get around this ?!