You must add app icons to proceed , or either some bundle settings are not recognizing the app icons you have added already.
Application Icon - Every iOS app must define an application icon. This is the icon that the user will tap from the iOS home screen to launch the app. Additionally, this icon is used by Game Center, if applicable.
Take a look at this thread for Xamarin where all of it is included , Good Luck !
https://docs.microsoft.com/en-us/xamarin/ios/app-fundamentals/images-icons/app-icons?tabs=macos
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