Hello, I'm building an unreleased game and testing it on both iOS 26.5.2 and iOS 27.0 Developer Beta, and getting the same error when trying to interact with GameKit. It doesn't seem to matter whether the game is deployed directly through Xcode or Testflight. The local player authenticates properly upon booting the game, but when trying to claim an achievement using the following code: try { var inProgressAchievements = await GKAchievement.LoadAchievements(); var gkAchievement = inProgressAchievements.FirstOrDefault(ach => ach.Identifier == "NEW_CASE"); if (gkAchievement == null) gkAchievement = GKAchievement.Init("NEW_CASE"); gkAchievement.PercentComplete = 100; await GKAchievement.Report(gkAchievement); } catch (GameKitException e) { Debug.LogError($"Failed to report achievement {achievement.IOSAchievementID}, error {e.Code} : {e.Message}"); } I get the following error: [Platform] [21.598] Failed to report achievement NEW_CASE, error -1003 : Code=-1003 Domain=NSURLErrorDomain Description=Aucun serveur ayant le nom d’hôte précisé n’a été détecté. Manavoid.Core.<<UnlockAchievement>gDoAsync|0>d:MoveNext() (at ./Library/PackageCache/com.manavoid.core@824a3b70b55f/Runtime/Platform/IOSSubsystem.cs:69) Apple.GameKit.GKAchievement:OnLoadAchievementsError(Int64, IntPtr) (at ./Library/PackageCache/com.apple.unityplugin.gamekit@1ebe01ff0665/Source/GKAchievement.cs:139) [Platform] [21.59859] Failed to report achievement , error -1003 : Code=-1003 Domain=NSURLErrorDomain Description=Aucun serveur ayant le nom d’hôte précisé n’a été détecté. Manavoid.Core.<<UnlockAchievement>gDoAsync|0>d:MoveNext() (at ./Library/PackageCache/com.manavoid.core@824a3b70b55f/Runtime/Platform/IOSSubsystem.cs:69) Apple.GameKit.GKAchievement:OnLoadAchievementsError(Int64, IntPtr) (at ./Library/PackageCache/com.apple.unityplugin.gamekit@1ebe01ff0665/Source/GKAchievement.cs:139) I currently have 18 achievements set up in Game Center. Some of them are still strictly IDs and have no localization data or artwork yet, if that matters. Opening the Game Center overlay in-game works, but I can't see any achievements listed. I did manage to see them once (with missing localization as expected), but I couldn't reproduce it consistently, most of the time Game Center simply says "0 out of 0 achievements". My Testflight build metadata looks like this: ***.app*** application-identifier: **********.com.***.*** get-task-allow: false beta-reports-active: true com.apple.developer.team-identifier: ********** com.apple.developer.game-center: true Help!