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Xamarin may not support XCode13 yet, try to downgrade Xcode and Visual studio to stable version(Xcode :12.5)
Please see this thread: Xcode 13.0 Support #12778
Providing 3 options.
You can download Xcode 12.5 from the downloads page in the Apple Developer Portal and continue to use it.
If you need to keep Xcode 13 but want to use our current stable d16-10 bits you will need to install the following in you macOS machine xamarin.ios-14.20.0.27.pkg xamarin.mac-7.14.0.27.pkg
Use a build from our xcode13-ios branch, this is where our next stable release is coming out and it includes all the iOS 15 SDKs APIs, that said we are still ironing it out.xamarin.ios-15.0.0.0.pkg
Here is a similar thread:Could not load the framework 'IBFoundation'
Best Regards,
Leon Lu
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