Add link to tracking issue.

Author: eerhardt

src/Security/Authentication/WsFederation/src/WsFederationHandler.cs

@@ -98,7 +98,7 @@ protected override async Task HandleChallengeAsync(AuthenticationProperties prop
         var wsFederationMessage = new WsFederationMessage()
         {
             IssuerAddress = _configuration.TokenEndpoint ?? string.Empty,
-            Wtrealm = Options.Wtrealm!,
+            Wtrealm = Options.Wtrealm!, // TODO: https://github.com/dotnet/aspnetcore/issues/50242
             Wa = WsFederationConstants.WsFederationActions.SignIn,
         };
 
@@ -425,7 +425,7 @@ public virtual async Task SignOutAsync(AuthenticationProperties? properties)
         var wsFederationMessage = new WsFederationMessage()
         {
             IssuerAddress = _configuration.TokenEndpoint ?? string.Empty,
-            Wtrealm = Options.Wtrealm!,
+            Wtrealm = Options.Wtrealm!, // TODO: https://github.com/dotnet/aspnetcore/issues/50242
             Wa = WsFederationConstants.WsFederationActions.SignOut,
         };