Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
@Steven Picton Based on the information you provided, it seems like you are following a quickstart guide for Xamarin Android and trying to configure a native client application. However, you are unable to add an API Permission through My APIs as nothing is showing up.
To clarify, are you trying to add an API Permission to the same app registration that you created for your Xamarin Android app? If so, have you already registered the API that you want to access in Azure Active Directory?
If you have already registered the API, you should be able to see it under "My APIs" in the Azure portal. If you are not seeing it, you may need to check if you have the correct permissions to view the API.
If you are still having trouble, please provide more information about the API you are trying to access and the steps you have taken so far. This will help me better understand the issue and provide you with a more accurate solution.