The error is Sources/LiveViewNativeMapKit/MapContent/Marker.swift:87:44 Cannot convert value of type 'String' to expected argument type 'Text'
Apple docs now have two options which are identical except one has monogram as String and one as Text.
init(LocalizedStringKey, monogram: String, coordinate: CLLocationCoordinate2D)
Creates a marker at the given location with the provided localized title and a monogram the map displays as the balloon's icon.
...
init(LocalizedStringKey, monogram: Text, coordinate: CLLocationCoordinate2D)
Creates a marker at the given location with the provided title key and monogram.
The error is
Sources/LiveViewNativeMapKit/MapContent/Marker.swift:87:44 Cannot convert value of type 'String' to expected argument type 'Text'
Apple docs now have two options which are identical except one has monogram as String and one as Text.