Microsoft Graph APi not returning "Cancelled" Events - microsoft-graph-api

Question

I am trying to get all the events in a Conference room's calendar with Microsoft graph API, given a startDateTime and endDateTime. I tried the following API's -
1. https://graph.microsoft.com/v1.0/users/{id}/events?startDateTime=2017-03-20T05:00:00.0000000&endDateTime=2017-04-06T21:00:00.0000000
2.https://graph.microsoft.com/v1.0/users/{id}/calendar/calendarView?startDateTime=2017-03-20T05:00:00.0000000&endDateTime=2017-04-06T21:00:00.0000000
The response includes all events with isCancelled=false. How do I fetch events which were Cancelled?
&$filter=isCancelled%20eq%20true also returned empty as there are no events with isCancelled=true in response

Answer 1

By design, when an event is canceled, it is deleted from the calendar. So, there isn't a way today to query list of events that are deleted. We have an item in our backlog for supporting deleted events, but no timeline.

Answer 2

I just tried
https://graph.microsoft.com/v1.0/Users/xx/Calendar/Events/xx/instances
?startDateTime=2020-02-17&endDateTime=2020-03-01&isCancelled=true
and what came back are all the non-cancelled events...
Ditto isCancelled=false
leaving off the &isCancelled=xx parameter returns all the events with the isCancelled attribute set to false for everything.

Answer 3

I was trying to fetch event after getting notification when event cancelled. I am trying with notification resource url and it throws exception:
Microsoft.Graph.ServiceException: Code: ErrorItemNotFound.
What I was expecting that response with notfound status code rather than throwing exception.
My code for fetching event:
var request = new EventRequest(
$"{_graphClient.BaseUrl}/{notification.Resource}",
graphClientApp,
null);
var message = await request.GetResponseAsync();
var response = await message.GetResponseObjectAsync();