Group Delete Notification doesn't work

Question

I want to be notified by the event when some Exchange Server group is deleted.
I'm creating the subscriptions as described in manuals: https://learn.microsoft.com/en-us/graph/api/resources/subscription?view=graph-rest-1.0

When I create a delete subscription with resource "groups" and changeType "deleted" it doesn't work at all.
When I create an update subscription with resource "groups" and changeType "updated" it catches both update and delete events.
When I create a combined subscription with resource "groups" and changeType "updated,deleted" it catches both update and delete events but doesn't distinguish between the two.

It looks like a bug in GraphAPI.

Answer 1

From the documentation here: https://learn.microsoft.com/en-us/graph/delta-query-groups#deltalink-response and https://learn.microsoft.com/en-us/graph/api/resources/directory?view=graph-rest-1.0 we see that when an item is deleted, it is added to the deleted items "container". Deleted items will remain available to restore for up to 30 days. After 30 days, the items are permanently deleted. This would explain the behavior above where when a group is deleted, an updated notification is sent.

Answer 2

Hello Diana,

What do you mean by the deleted items "container"?
The deleted group members indeed are seen somewhere like this:

"members@delta": [{
   "@removed": {
      "reason": "deleted"
   }
 }]

But the deleted groups simply disappear.
Moreover, the "deleted" action event never arrives and the "updated" action event arrives in both cases and always shows that the group has been updated.

If in both cases there is sent an "updated" event, how can I know when it is updated and when deleted?