title: {"message":"Unauthorized"} in API Gateway in Cognito Authorizer
body: <p>I get {"message":"Unauthorized"} error when I add cognito authorizer to my API defined in API Gateway.
  I did the following:</p>
  
  <ol>
  <li>Configured a Cognito Authorizer</li>
  <li>Added the Authorizer in API method</li>
  <li>Deployed the API </li>
  </ol>
  
  <p>As i hit the API url. I get the {"message":"Unauthorized"} error.
  Am I missing anything?</p>