title: Are event subscriptions available in an office-365 hybrid deployment
body: <p>We have a customer who has a hybrid o365 deployment with all of their calendars/mail boxes on-premise. We have successfully queried the Graph API for the user calendars. However when we attempt to create a subscription to a user calendar we have the following 404 error...</p>
  <pre><code>{\&quot;code\&quot;:\&quot;ExtensionError\&quot;,\&quot;message\&quot;:\&quot;Operation: Create; Exception: [Status Code: NotFound; Reason: The mailbox is either inactive, soft-deleted, or is hosted on-premise.]\
  </code></pre>
  <p>The error seems to strongly indicate that the subscription is not supported due to the mailbox still being on-premise. However, I cannot find documentation that definitively states that subscriptions are not supported in hybrid environments. I need a definitive statement that I can return to the client.</p>
  <p>I found an older post on SO where that conclusion was hinted at, but again, nothing definitive...</p>
  <p><a href="https://stackoverflow.com/questions/52910327/status-code-notfound-reason-not-found-when-creating-subscription-to-on-prem">&quot;Status Code: NotFound; Reason: Not Found&quot; when creating subscription to on-premise mailbox</a></p>
  <p>I've also read the documentation on Graph support for hybrid deployments and could not locate my &quot;smoking gun&quot;.</p>
  <p><a href="https://docs.microsoft.com/en-us/graph/hybrid-rest-support" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/graph/hybrid-rest-support</a></p>
  <p>Is there documentation regarding this that I have simply overlooked, or can a MSFT SME comment in this regard?</p>