How to configure AAD authentication for app service behind App Gateway if there are more than one web app that need the OAuth capability using the same App Gateway

Question

Hi,

I need to interface multiple App Services, each one with AAD authentication, with a single Application Gateway.

Already went through below articles -

https://learn.microsoft.com/en-us/archive/blogs/waws/setting-up-application-gateway-with-an-app-service-that-uses-azure-active-directory-authentication-and-url-authorization-rules

https://learn.microsoft.com/en-us/archive/blogs/waws/setting-up-application-gateway-with-an-app-service-that-uses-azure-active-directory-authentication

But, this works for a single App Service with custom domain mapped to the Application Gateway.

How to go about if I need to make use of a single Application Gateway with multiple App Services (each one with AAD auth) ?

Topology is, the App Gateway will be in Hub subscription. The non-production App Services will be inside non-production subscription inside sub-environments.

Your valuable suggestions will be very helpful to proceed here.

Thanks & Regards,
Sampa