I\'ve found different topic about this, but neither got me the maps working in my activity. I\'ve followed the guide provided by google about using maps from google play service
When you cant see map and also no error that means it is a problem with API key. You need to get an API key from google to use Google Map perfectly. To get the API key you need to follow some steps and in one of those steps you need to use the SHA fingerprint key. However the link below shows you the steps.
https://developer.xamarin.com/guides/android/platform_features/maps_and_location/maps/obtaining_a_google_maps_api_key/