Hi @Imanol112 ,
The doc you're looking for is https://learn.microsoft.com/en-us/azure/app-service/overview-authentication-authorization. It gives you a broad overview of how to leverage the multiple providers to enable authentication and authorization. For Google in particular, see https://learn.microsoft.com/en-us/azure/app-service/configure-authentication-provider-google on how to configure your app service for Google sign-in.