Graph API Calendar does not work on onPrem outlook?

Question

I am using graph calendar api GET https://graph.microsoft.com/v1.0/me/events

In order to get users meetings/scheduled events however the api is returning "404 Resource Not Found."

The user in question a an AAD user synced with the cloud, however I am told that the outlook mailbox itself is on-prem and not synced to the cloud.

Would someone be able to explain to me how I can get the calendar graph api to work for this user? (Without bringing their outlook mailbox on prem)

I also notice Graph API calendar api should work on on-prem services. Is this a fair assumption to make?

Answer 1

You should use REST APIs to access mailboxes in Exchange hybrid deployments (preview), so that you can access the resources from Exchange online & Exchange Onprem. If your app uses v1.0 of the Mail, Calendar, or Contacts API, you will now also find a seamless authentication and application experience in hybrid deployments, regardless of whether the mailbox is on-premises or in the cloud, provided that the deployment meets specific requirements.

Answer 2

@Deva-MSFT Thanks for linking the article

I have a specific concern I was wondering if you could help me out with.

I have a customer that meets all those requirements, hybrid setup in exchange 2016 with exchange-ad synced with azure-ad etc. etc.
Only issue is outlook mailbox is NOT sync'd to azure. Does this disqualify them from calendar graph api usage?