With iOS 16, Apple made some old APIs non-functional. This includes also the established way of locking the orientation. In this blog post, I am going to show you how you can lock orientation on iOS 16 while the app is running with both .NET MAUI and Xamarin.Forms.
https://msicc.net/how-to-lock-orientation-at-runtime-on-ios-16-with-net-maui-and-xamarin-forms/