title: expo AuthSession.startAsync does not redirect to universal login after the first success
body: <p>I am building an <a href="https://github.com/ocdexperience/auth0-example" rel="nofollow noreferrer">expo app</a> that leverages auth0 for authentication.</p>
  
  <p>I have trouble switching to another account after I have successfully logged in and logged out. The details reproduce steps are:</p>
  
  <ol>
  <li>Pull the project, <code>yarn install &amp;&amp; expo start --ios</code></li>
  <li>(Optional) For your safety, replace <code>auth0ClientId</code> and <code>auth0Domain</code> in App.js with your own auth0 info</li>
  <li>Press "Log in with Auth0", get a prompt, and finally see something like below <a href="https://i.stack.imgur.com/ze8Aw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ze8Aw.png" alt="enter image description here"></a></li>
  <li>Log in with gmail (there should be such an option, even though it is not in this picture)</li>
  <li>If you successfully log in, you should be able to see "You are logged in, !"</li>
  <li>Press "Log out"</li>
  <li>If you try to redo step 3-4, you are no longer able to see the universal login page as shown in the picture. Instead, you are logged in directly.</li>
  </ol>
  
  <p><a href="https://stackoverflow.com/questions/55405829/how-do-i-clear-cookies-on-expo-authsession-startasync-on-android">This thread</a> describes the same behavior but he assumes it is client that caches the authentication info in cookie. I don't think this is the reason. I believe auth0 caches the first logged in user on server side and return the cached result regardless. My evidence: I add this <code>console.log</code> at <a href="https://github.com/ocdexperience/auth0-example/blob/master/App.js#L68" rel="nofollow noreferrer">https://github.com/ocdexperience/auth0-example/blob/master/App.js#L68</a> and every time I try to log in, this line always print that's why I guess <code>await AuthSession.startAsync({ authUrl })</code> returns the cached result directly.</p>
  
  <p>Thank you for the help.</p>