title: MS Graph API: 503 error on shared calendar read
body: <p>Trying to read from another User's Calendar using Microsoft Graph. </p>
  
  <p>Using the following <code>GET</code> in Graph Explorer, I get an <code>HTTP 503</code> error returned:</p>
  
  <pre><code>https://graph.microsoft.com/v1.0/users/anotherUser@myCompany.com/events
  </code></pre>
  
  <p>Weird thing is that I can run this against myself and it lists my events as expected:</p>
  
  <pre><code>https://graph.microsoft.com/v1.0/users/myEmail@myCompany.com/events
  </code></pre>
  
  <p>I suspected it was a permissions issue, however I have checked and <code>anotherUser@mycompany.com</code> has full access delegated powers to <code>myEmail@myCompany.com</code>.</p>
  
  <p>Any ideas?</p>