Odtnhj

I have a problem with my Microsoft Graph webhook subscriptions to /me/events. What I want to do is to subscribe to all user calendars.

First I have created the new app in https://apps.dev.microsoft.com using my personal Microsoft account.
Then in my app I subscribe to /me/events notifications using access token:

POST https://graph.microsoft.com/beta/subscriptions


 "changeType": "created,updated",
 "notificationUrl": "https://xxxxx.ngrok.io/notification-url",
 "resource": "/me/events",
 "expirationDateTime": "2018-11-14T09:40:10.933Z",
 "clientState": "xxxx-xxxx-xxxx-xxxx"

My notificationUrl receives validation request to which my app responds with 200 OK and validation token. After that the POST request returns me my subscription:

 "@odata.context" : "https://graph.microsoft.com/beta/$metadata#subscriptions/$entity",
 "id" : "2773aa4c-e983-4d15-9236-xxxxxxxx",
 "resource" : "/me/events",
 "applicationId" : "d551ec34-8d44-4cc6-9b88-xxxxxxxx",
 "changeType" : "created,updated",
 "clientState" : "xxxx-xxxx-xxxx-xxxx",
 "notificationUrl" : "https://xxxxx.ngrok.io/notification-url",
 "expirationDateTime" : "2018-11-14T09:40:10.933Z",
 "creatorId" : "00000000000"

This subscription works fine but only for one, default calendar in Outlook. I don't receive any notifications if I create, update events in any other calendars that exists in my account.

What could be the problem here, am I using wrong resource name (/me/events) or this is some limitation for personal accounts in Microsoft Graph?

When you use /me/events you are going to the default Calendar for the user (per the docs). In your case, you would want to enumerate the user's calendars (GET /me/calendars) then subscribe to each one's events collection, using the resource /me/calendars/calendar-id/events.