Logout error when using Easy Auth v2

[jwevansgam]

Just want to put this out there but not sure if it should be a bug report or not, let's see how this goes

I have created a very vanilla ASP.NET Core MVC project using the Visual Studio 2019 project template, added a dependency to the Microsoft.Identity.Web (UI) projects (using v1.10), added the authentication code in startup, published to Azure App Service and enabled App Service Authentication v2 (Easy Auth). The default project has a _LoginPartial.cshtml file under views which points to the asp.area which is in the Microsoft.Identity.Web.UI project. This all works ok but I get an error when using the SignOut button. The error is

Value cannot be null or empty: (Parameter: 'localUrl')

The problem is this line of code

return LocalRedirect(AppServicesAuthenticationInformation.LogoutUrl);

https://github.com/AzureAD/microsoft-identity-web/blob/master/src/Microsoft.Identity.Web.UI/Areas/MicrosoftIdentity/Controllers/AccountController.cs#L117

This resolves down to accessing the environment variable WEBSITE_AUTH_LOGOUT_PATH

The problem is App Service Authentication v2 (recently released) doesn't set this environment variable anymore, it is deprecated. See the below link.

https://social.msdn.microsoft.com/Forums/vstudio/en-US/17661111-c2d9-41ac-ab5b-df1cf7190585/websiteauthlogoutpath-since-novemeber-2015?forum=windowsazurewebsitespreview

Do you guys know about this issue? should I report as a bug?

[jmprieur]

@jwevansgam. Yes please, report a bug. (you can use ... reference in new issue to avoid you retying everything)
Thanks for sharing this ink on the deprecation in Easy Auth. I wonder if we can have a way of knowing about these breaking changes?
@navyasric would you know?

[jwevansgam]

Thanks for the reply. BUG #1234 raised for this