DidUpdateUserLocation event never gets called when displaying Map on Xamarin IOS - ios

Question

I am currently trying to display my location using MKMapView on Xamarin IOS without much success. DidUpdateUserLocation event never gets called so no location coordinates are provided. I am using the below permission in my Info.plist file:
NSLocationWhenInUseUsageDescription
location
[Register("MapsViewController")]
public class MapsViewController : UIViewController {
private MKMapView mapView;
private CLLocationManager locationManager = newCLLocationManager();
private CLLocationCoordinate2D coords;
public override void ViewDidLoad() {
base.ViewDidLoad();
mapView = new MKMapView(new CGRect(0, 0, View.Frame.Width, View.Frame.Height));
mapView.ShowsUserLocation = true;
this.View.AddSubview(mapView);
locationManager.RequestWhenInUseAuthorization();
mapView.ShowsUserLocation = true;
mapView.DidUpdateUserLocation += (sender, e) => {
if (mapView.UserLocation != null) {
coords = mapView.UserLocation.Coordinate;
MKCoordinateSpan span = new MKCoordinateSpan(MilesToLatitudeDegrees(2),
MilesToLongitudeDegrees(2, coords.Latitude));
mapView.Region = new MKCoordinateRegion(coords, span);
}
};
}
public double MilesToLatitudeDegrees(double miles) {
double earthRadius = 3960.0;
double radiansToDegrees = 180.0 / Math.PI;
return (miles / earthRadius) * radiansToDegrees;
}
/// <summary>
/// Converts miles to longitudinal degrees at a specified latitude
/// </summary>
public double MilesToLongitudeDegrees(double miles, double atLatitude) {
double earthRadius = 3960.0;
double degreesToRadians = Math.PI / 180.0;
double radiansToDegrees = 180.0 / Math.PI;
// derive the earth's radius at that point in latitude
double radiusAtLatitude = earthRadius * Math.Cos(atLatitude * degreesToRadians);
return (miles / radiusAtLatitude) * radiansToDegrees;
}