SDKBOX Play 2.2.12 is it usable?

We now trying second time to implement Leaderboards with SDKBOX Play framework and seems again no luck. Is this framework tested and works well or just experimental?

Current issue on IOS that, when set flag autologin - user not get logged into Game Center and no default notification appear that you connected, but SDKBOX isConnected() function showing that user is connected and when opening leaderboards they are empty.

Is it issue with SDKBOX or it happens because app is in Development stage and could be Apple bug?

Make sure you’re using test user account in iTunes connect, also if there is some kind of error message that would be great.