Hi AndyPennellMSFT-5724,
Welcome to our Microsoft Q&A platform!
Yes, according to the document Xamarin.iOS release notes and API changes, we can only get Xamarin.iOS 16.19.
So a workaround is uninstalling the Xamarin.iOS on your Mac using the script provides in Uninstall Xamarin.iOS.
Then download and install Xamarin.iOS 16.19. When you re-connect to Mac with Visual Studio, it may pop up "Xamarin.iOS versions mismatch". Just select "Cancel => OK". Now you can use Xamarin.iOS normally.
Checking the Xamarin.iOS Release on GitHub, we see that xamarin-ios-14.20.0.24 exists. For this issue "14.20.0.25", you can submit an issue on GitHub: xamarin/xamarin-macios.
Regards,
Kyle
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