I am having the same problem. and I used the latest version of the plugin. When I open the Game Center window, nothing happens when I click the X in the upper right corner.

The game's leaderboard must be launched to access it. The id often needs to be in an [array] to be recognized. It is recommended to use try catch to catch error messages. Below is a part of the code I used. try { var gameCenter = GKGameCenterViewController.Init(GKGameCenterViewController.GKGameCenterViewControllerState.Leaderboards); await gameCenter.Present(); } catch (GameKitException ex) { Debug.LogError($"GameKitException while presenting leaderboard: {ex.Message}"); } catch (Exception ex) { Debug.LogError($"Unexpected error while presenting leaderboard: {ex.Message}"); }