Regarding to the XCode version we do not have a table with details on which Xamarin.iOS version our dlls are build. We always try to update the mac machines, Xamarin.iOS sdk, XCode to their latest versions.
Our latest dlls are build against Xamarin.iOS 15.4. My suggestion is to have at least this version of Xamarin.iOS on your mac machine.
Regards,
Didi
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