I am currently experiencing this right now below is my data. Occurs on: iPhone 17 Pro with iOS 26.2 Simulator iPhone 17 Pro with iOS 26.1 Simulator Does not occurs on: iPhone 16 Pro Max with iOS 26.2.1 I have verified the following states for GKLocalPlayer and GKAccessPoint GKLocalPlayer: -- isAuthenticated: true -- isUnderage: false -- isMultiplayerGamingRestricted: false GKAccessPoint: -- isActive: true -- isVisible: true -- parentWindow: nil On app launch when GameKit goes through the auth flow I see these errors. [GameCenterOverlayService] Could not create endpoint for service name: com.apple.GameOverlayUI.dashboard-service [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy When I call the following: GKAccessPoint.shared.trigger {} I see these errors: [GameCenterOverlayService] Could not create endpoint for service name: com.apple.GameOverlayUI.dashboard-service [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy I have tried setting the GKAccessPoint parent window using the following: if accessPoint.parentWindow == nil { let windows = UIApplication.shared.connectedScenes .compactMap { $0 as? UIWindowScene } .flatMap { $0.windows } print("Windows: (windows.count)") if windows.count >= 1 { accessPoint.parentWindow = windows.first } accessPoint.isActive = false accessPoint.isActive = true } and verified the parentWindow is then set. But that just results in the following errors. Two errors for each toggle of isActive. [GameCenterOverlayService] Could not create endpoint for service name: com.apple.GameOverlayUI.dashboard-service [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy [GameCenterOverlayService] Could not create endpoint for service name: com.apple.GameOverlayUI.dashboard-service [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy I will try creating a new simulator using an iPhone 16 but I suspect it has more to do with simulator vs. real device and some low level bug. I hope this info is helpful and I'll try to watch this thread if there a request for follup input.

This is still broken on: Mac OS 14.3.1 (23D60) Mac Book Pro (16-inch, Nov 2023) M3 Max Following the Read Me.rtf steps for Game Proting Toolkit-1.1. At this step • Install the game-porting-toolkit formula. This formula downloads and compiles several large software projects. How long this takes will depend on the speed of your computer. brew -v install apple/apple/game-porting-toolkit Error: apple/apple/game-porting-toolkit 1.1 did not build Logs: /Users/jonathan/Library/Logs/Homebrew/game-porting-toolkit/00.options.out /Users/jonathan/Library/Logs/Homebrew/game-porting-toolkit/01.configure /Users/jonathan/Library/Logs/Homebrew/game-porting-toolkit/01.configure.cc /Users/jonathan/Library/Logs/Homebrew/game-porting-toolkit/02.make /Users/jonathan/Library/Logs/Homebrew/game-porting-toolkit/wine64-build If reporting this issue please do so to (not Homebrew/brew or Homebrew/homebrew-core): apple/apple It seems most unfortunate the default Read Me steps fail. I did try the next step if there was an error but the same error issue occured. • If during installation you see an error such as “Error: game-porting-toolkit: unknown or unsupported macOS version: :dunno”, your version of Homebrew doesn’t have macOS Sonoma support. Update to the latest version of Homebrew and try again. brew update
brew -v install apple/apple/game-porting-toolkit Someone from Apple responsible for Game Toolkit should probably take a look at this.