Portals have been enhanced this year with the ability to cross portal boundaries. It's discussed around the 20 minute mark, "Portal Enhancements" in the following video: https://developer.apple.com/videos/play/wwdc2024/10103/

When tapping anywhere on a Map view, I get a warning "Trying to convert coordinates between views that are in different UIWindows, which isn't supported. Use convertPoint:fromCoordinateSpace: instead." I'd guess it's got something to do with that.

The approach would be to iterate inside the map using ForEach() to add the markers. Add a title string property to IdentifiableAnnotation and display it as such: Map(coordinateRegion: $locationManager.region, interactionModes: .all, showsUserLocation: true, userTrackingMode: .none) { ForEach(courtAnnotations) { item in Marker(item.title, coordinate: item.annotation.coordinate) } }