@muzzkat2 I was already about to give up and just use GKLocalPlayer.GamePlayerId as a Custom Identifier to log in to my game until I saw your reply. Thank you! Will check this out! 🙏

Is there anyone in the Apple Dev Team that can help?? MacOS 12.5 Monterey Unity 2021.3.4f1 XCode 14.2 AppleCore Unity Package - 1.0.2 AppleGameKit Unity Package - 1.0.3 Crashes when calling FetchItems in Unity Installed in iPhone XR (iOS 15.2.1)