Same scenario as you. In iOS beta 3, they mentioned: Attempting to set an orientation on UIDevice via setValue:forKey: isn’t supported and no longer works. (93367651) In iOS beta 4 which is released yesterday, they mentioned it is Fixed. However, the issue still the same on iOS 16 beta 4 [Orientation] BUG IN CLIENT OF UIKIT: Setting UIDevice.orientation is not supported. Please use UIWindowScene.requestGeometryUpdate(_:) My code is working fine on older iOS versions too.

Are you testing on iOS 16 beta? This is mentioned as bug on iOS 16 beta. https://developer.apple.com/documentation/ios-ipados-release-notes/ios-ipados-16-release-notes Although it mentioned is fixed on iOS 16 Beta 4, I still experience the same. This discussion is similar as yours. https://developer.apple.com/forums/thread/707735