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Facebook audience network
is supported in Android and iOS, there are Xamarin.Facebook.AudienceNetwork.Android and Xamarin.Facebook.AudienceNetwork.iOS packages from Nuget. You could create a view to display ads in Xamarin.Forms, and use customrenderer on each platform.
APP setup is necessary, accounding to Facebook docs, you need to register App , set app platform information and son on. Then you can implement it.
Here is a thread about iOS, you could also refer to
https://learn.microsoft.com/en-us/answers/questions/251544/xamarinforms-facebook-audience-network-ads-not-hav.html
Best Regards,
Wenyan Zhang
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