title: How to add : "config.SignIn.RequireConfirmedEmail = true;" Extended ApplicationUser
body: <p>I want to add in : <code>config.SignIn.RequireConfirmedEmail = true;</code> to my startup code in .net core 2.2. </p>
  
  <p>The example given by Microsoft shows how to do it for the stock standard identity user, but I have extended the user and it is now <code>ApplicationUser</code>.</p>
  
  <pre><code>services.AddIdentity&lt;ApplicationUser, ApplicationRole&gt;(               
      options =&gt; options.Stores.MaxLengthForKeys = 128
  );
  </code></pre>
  
  <p>But in Microsoft example, it is like this (see below) which does not suit my needs...</p>
  
  <pre><code>   services.AddDefaultIdentity&lt;IdentityUser&gt;(config =&gt;
      {
        config.SignIn.RequireConfirmedEmail = true;
      })
  </code></pre>
  
  <p>How do I include this in my code using config ?</p>