I'm having the same problem. I have a custom player in a UIVIew and on full screen it doesn't rotate.
I have this massage:
Error Domain=UISceneErrorDomain Code=101 "None of the requested orientations are supported by the view controller. Requested: landscapeLeft, landscapeRight; Supported: portrait" UserInfo={NSLocalizedDescription=None of the requested orientations are supported by the view controller. Requested: landscapeLeft, landscapeRight; Supported: portrait}
Anyone found a solution?