I am using a Web App for which I have implemented AD Authentication from the Authentication Tab in App Service. I have followed below link for Sigin and Signout functionality.
https://learn.microsoft.com/en-us/azure/app-service/configure-authentication-customize-sign-in-out
I dont have any issues for Redirect URL : /.auth/login/aad/callback
But when I use /.auth/logout for Signout, I am navigating to page Not found error.
References I am using is Microsoft.Identity.Web
(Based on my company Audit, we have to enable Authentication in App Service, while doing so it is expecting redirect url to be /.auth/login/aad/callback. So I have followed above url for this implementation).