When i use GPGS in our games 2 yrs back, there was some issue with initialization. Then i found the solution that it needs DRIVE API and one more thing to be enabled in console. I tried that and it works perfectly after that.
Now i am afraid as i got an email from “Big G”. They have clearly mentioned that all my games have used DRIVE Api which is depricated and will be stopped in Dec 2019. Please look into this matter and ensure that leaderboards will not get effected by this. I am afraid if it gets stopped then all the users will be feel bad and leave my game.
So its a request to please look into this and make sure that this move by G will not effect users.
I hope you got my issue and make it resolved soon.