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.
danielanddaniel
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
From
Singapore
Post
Replies
Boosts
Views
Activity
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