title: After upgrading to .net6 from .net4.8 FederatedAuthentication.FederationConfiguration does not exists
body: <p>I just upgraded my .net4.8 web app to .net6 using upgrade assistant among the other errors I get, in my SignIn function I cannot use the following:</p>
  <pre><code>WsFederationConfiguration config = FederatedAuthentication.FederationConfiguration.WsFederationConfiguration;
  </code></pre>
  <p>I get the error:</p>
  <blockquote>
  <p>'FederatedAuthentication' does not contain a definition for 'FederationConfiguration'</p>
  </blockquote>
  <p>It seems like FederationConfiguration is no longer supported in .net6. What is the best alternative?</p>