Can someone please tell me why my pins are not showing on the map?

I am trying to populate a map with locations obtained from an API but it is proving very problematic. When I create a pin from the code behind it shows fine, but it does not show when I use xaml. I would really like to understand what I am doing wrong, thanks! The API successfully stores a longitude and latitude in the ObservableCollection and I can confirm that through debugging, it is just not represented on the map!

View

    <Grid>
        <maps:Map x:Name="ItemsSource="{Binding Locations}">
            <maps:Map.ItemTemplate>
                <DataTemplate>
                    <maps:Pin Position="{Binding Address="{Binding Name}" Label="{Binding Description}" />
                </DataTemplate>
            </maps:Map.ItemTemplate>
        </maps:Map>
    </Grid>

Code-behind

        private ITestApiService _testAPIService = new TestApiService();
        public MainPage()
        {
            InitializeComponent();
            BindingContext = new MainPageViewModel(_testAPIService);
            map.MoveToRegion(MapSpan.FromCenterAndRadius(new Position(51.507351, -0.127758), Distance.FromMiles(100)));
        }
    }

ViewModel

class MainPageViewModel
    {
        public ObservableCollection<Location> Locations { get; set; }
        private ITestApiService TestApiService{ get; set; }
  
        public MainPageViewModel(ITestApiService testApiService)
        {
            TestApiService= testApiService;
            PopulateEventMapView();
        }

        private async void PopulateEventMapView()
        {
            var events = await TestApiService.GetEvents();
            Locations = CreateLocation(events);
        }

        private ObservableCollection<Location> CreateLocation(List<Event> events)
        {
            var locations = new ObservableCollection<Location>();
            foreach (var eventItem in events)  
            {
                locations.Add(new Location(eventItem.Name, eventItem.Description, new Position(eventItem.Venue.Latitude, eventItem.Venue.Longitude)));
            }
            return locations;
        }
    }