I have enabled Game Center in App Store Connect, as well as the entitlements in Xcode for both my parent (stub) target and extension target. I call the Game Center authentication function which returns a "Signed in as: [my username]" banner during testing. However, when it is tapped on by the user, it opens the Game Center view where "Now Playing _" shows a blank title and app icon. I have a full size app icon that App Store Connect and even GameKit recognizes (https://games.apple.com/us/game/6757935828) but not when I actually run my iMessage app. When I call the authentication function, it completes (hence the banner), but then says later on Game Center does not recognize my app and that my achievements cannot be reported to Game Center. Is Game Center fully disabled for iMessage apps? Or is there a solution I am missing? My goal is to have achievement banners show up for winning iMessage games and certain gameplay combos.