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azure-functionsmicrosoft-graph-apimicrosoft-graph-sdksmicrosoft-graph-calendar

Does Microsoft Graph change notification always send UPDATED notification for CREATED events?

I'm using Microsoft Graph API change subscription to handle created/updated/deleted calendar events.

I noticed that the API always sends at least one UPDATED notification for each newly CREATED event. A quick search shows that it's normal behavior.

My question is: can this be considered a guaranteed behavior of the API?

If so, my plan is to only subscribe to UPDATED and DELETED notifications and treat each UPDATED event as a potential CREATED event depending on if a local copy already exists. This approach helps me deal with concurrency issues. I just want to make sure I won't miss any CREATED events this way.

Solution

  • Yes, it is a guaranteed behavior, it is a known issue when you use the change notification of the user calendar event(/users/{id}/events).

    See Additional notifications for users:

    Subscriptions to changes for user with changeType set to updated will also receive notifications of changeType: updated on user creation and user soft deletion.