title: Google play games services not working during testing phase
body: <p>I developed a game using unity engine for android platform.</p>
  
  <p>I have used GPGS plugin from github</p>
  
  <p>But i was unable to "sign in" into GPGS during testing phase(A popup comes up saying "connecting to GPGS" loads 2 times and vanish).but as soon as i published my game on google play store,GPGS starts working properly(now i am able to sign in to my account).</p>
  
  <p>Where i was wrong during my testing phase?</p>
  
  <p>I already add tester email on google play console</p>