I turned on Saved Games and I am now able to open the leaderboard from my mobile game. BUT my score is not being sent and I am not seeing my gamer tag appear at the top of the screen as it usually does when you sign into Android games.
Could this be another issues/bug or is it something I missed?
I turned on the Save Games Option and it was fine after. I have my Google Play Console to use both debug and release mode by changing the package name in Gradle, Appending .dev when in Debug mode.