title: Graph request to list root children returns empty
body: <p>I'm using the <a href="https://graphexplorer2.azurewebsites.net" rel="nofollow">graph explorer</a> to try list the root's children via call to <code>GET /drive/root/children</code> but getting empty response (while I have many files &amp; folders in my directory): </p>
  
  <pre><code>{
    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#drive/root/children",
    "value": []
  }
  </code></pre>
  
  <p>Any idea why and how to fix this?</p>