Xamarin.Forms.Maps in macOS

Hello

I'm building a Xamarin.Mac App which is using a Xamarin.Forms PLC to integrate a Maps feature, the one described here:
https://github.com/xamarin/xamarin-forms-samples/blob/master/WorkingWithMaps/WorkingWithMaps/PinPage.cs

In my Xamarin.Mac/PCL solution, I followed the same model described in the iOS part of the article in the link above
I am now able to add pins to the map, manage movement, bearing...

However since the beginning I get a black screen instead of the map which I'm not able so far to get rid of
In this black screen it is possible to see the link to the legal info of Apple Maps, which make me think that something is missing regarding an authentication key or things like that

Please help if you have any idea to solve this issue

Regards