Issues with integrating google play games with Unity game

[Youssef abou el fotouh]

Hello ,

I'm having trouble with integrating google play games into my unity game.

Whenever i try to authenticate by calling method :

Social.localUser.Authenticate(success => { });

i get the google play games popup , but then i do not get the screen that makes me choose an account to authenticate.

And i get in my log :

WARNING: Failed to sign in to Google Play Game Services.

From my research , i understood that it was an issue with SHA-1 key , and people suggested switching between SHA-1 keys of "App signing certificate" and "Upload certificate" in the credentials of google developer console (under OAuth 2.0 client IDs).

However , i tried switching between both keys but with no luck , and finally i have both keys now in my google developer console at the same time and authentication still fails !

What could be wrong ?

Does my game have to be published in google play and also in game services (inside play console ) so that authentication works ?

Also note that i have added my email as a testing email under the section of "Testing" inside game services of my play developer account.