title: Getting error posting calendar events
body: <p>Using the Unified API call 
  <code>POST https://graph.microsoft.com/{version}/{tenant}/groups('{groupId}')/events</code></p>
  
  <p>to add calendar events to a group. I'm intermittently getting the following error: </p>
  
  <blockquote>
    <p>An unexpected 'PrimitiveValue' node was found when reading from the
    JSON reader. A 'StartObject' node was expected.</p>
  </blockquote>
  
  <p>My Json object looks to match what is provided in the online documentation.  Has anyone seen this error and, if so, do you have a resolution?</p>