WinRT GetGeopositionAsync works in JavaScript not in C++?

Question

Just curious if this is a bug or if I'm doing it wrong. I'm trying to use the Geolocator from WinRT. I have a test Metro app in Javascript and everything works with this code:

var locator = Windows.Devices.Geolocation.Geolocator();
var promise = locator.getGeopositionAsync().then(
    function (pos) {
        Loc.innerText = "Lat: " +  pos.coordinate.latitude + ", Lng: " + pos.coordinate.longitude;
    });

I'm trying to do the same thing in C++ app with this code but it doesn't ever enter my lambda:

auto locator = ref new Geolocator();
auto operation = locator->GetGeopositionAsync();
operation->Completed =  ref new AsyncOperationCompletedHandler< Geoposition^ >(
    [=](IAsyncOperation<Geoposition^>^ operation)
    {
        auto result = operation->GetResults(); 
        std::wstringstream ss;
        ss << L"Lat: " << result->Coordinate->Latitude << L", Lng: " << result->Coordinate->Longitude;
        this->Loc->Text = ref new String( ss.str().c_str() );
    });

I've turned on the Location capability in both apps. Any suggestions?