title: Create webhook notification url in microsoft onenote
body: <p>I am trying to subscribe webhook in one note getting following error:</p>
  
  <pre><code>Client error: POST https://graph.microsoft.com/v1.0/subscriptions resulted in a 400 Bad Request response:
  {
  "error": {
  "code": "InvalidRequest",
  "message": "Subscription validation request failed. Response must ex (truncated...)
  </code></pre>