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.
ZionHuh
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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}");
}