iOS Game Center: Scores not showing on leaderboard in sandbox

Solution 1:

I ran into the same issue with projects I've worked on.

The GC Leaderboards (Sandbox/live) will only return scores if there are two or more players on the Leaderboards.

So make sure you either submit the score with 2 different accounts on one 1 device or 2 different accounts on separate devices.

Solution 2:

Try changing timeScope.

Sometimes GKLeaderboardTimeScopeAllTime & GKLeaderboardTimeScopeToday returns nothing but GKLeaderboardTimeScopeWeek works fine. I think it's a GC sandbox server problem.

Hear us Apple: use some of those billions to make your web services better.