Hey, I did that, but it still doesn't work. Did you link the app with Web or with Android on google console? And did you do anything special to the leaderboard on google console, other that the obvious steps of creating it? Also it seems that the auto sign In doesn't work on the phone. On preview I allowed pop-ups and it works here, but on the phone it seems to be loading, but nothing shows.
I linked the app with Android, not Web.
I created the leaderboard then published it. Make sure it says "Published" in upper right. Other than that, that's all I did.
Once I got sign in to work, the pop-up showed asking which account I wanted to sign in with, i selected, then it was done. I haven't seen it since. Every time I play, the status bar and navigation buttons show briefly, then disappear. I tested on another device and it only asked for sign in once, and then I'm signed in each time I play.