Xamarin, need to know country where user it is login...

I have develop a Xamarin app consuming Azure resources like Azure functions.
Apps it works in any place over the world.
Architecture it is defined by tenant (aligned to Azure tenant).
So I would like use the same app in any place so I need to know before user signing which country is login, to redirect to appropriate Azure resource.
I found some methods, but I could not return country information based on GPS position.
Any idea.
Thanks