Update: I was able to make it work by passing the TeamPlayerId instead of the GamePlayerId to PlayFab, but i'm not sure this is a real solution or if it's secure. Most apple documentation tells me to use GamePlayerId unless I want o track users across multiple games. But the fetchItems page says the opposite in case of authentication Share the teamPlayerID and the bundle ID (see CFBundleIdentifier) with the server. For Apple Arcade games, share the gamePlayerID instead of the teamPlayerID I'm fine with using the TeamPlayerId if it's safe and correct, but the thing is, my other game uses GamePlayerId and has no issues. I'm confused about what's happening in here