Identity example doesn't work.

### Description

Verbatim:

>The example given for Use WS-Federation without ASP.NET Core Identity does not work. The user is authenticated by ADFS but the application does not recognise the user has been authenticated, and an authentication loop starts. There is something missing in the example.

### Page URL

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/ws-federation?view=aspnetcore-8.0

### Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/ws-federation.md

### Document ID

d07c4058-452f-cdac-c59d-8f09e70a43f3

### Article author

@chlowell