title: The AuthorizationPolicy named: 'Admin' was not found
body: <p>I am learning Authentication/Authorization in .NET Core MVC. </p>
  
  <p>I am trying to create a controller that can only be accessed by 'Admin', but get the following error.</p>
  
  <blockquote>
    <p>An unhandled exception occurred while processing the request.</p>
    
    <p>InvalidOperationException: The AuthorizationPolicy named: 'Admin' was
    not found.</p>
  </blockquote>
  
  <p>Here's my code. What should I do?</p>
  
  <pre><code>[HttpGet("~/Test")]
  [Authorize("Admin")]
  public async Task&lt;string&gt; MyMethod()
  {
      return await Task&lt;string&gt;.Run(() =&gt; "Hello Admin");
  }
  </code></pre>