About Graph API permissions and settings

Question

I want to register schedule-event by Graph API from
Graph Explorer as an administrator.

What I did was, I logged in to Graph Explorer as an administrator and Entered the following query.

[POST]
https://graph.microsoft.com/v1.0/users/{target user's id}/calendar/events

And in the request body, I described the following json format contents.

{
"subject": "Create by GraphAPI",
"body": {
"contentType": "HTML",
"content": "Does mid month work for you?"
},
"start": {
"dateTime": "2021-08-16T12:00:00",
"timeZone": "Tokyo Standard Time"
},
"end": {
"dateTime": "2021-08-16T14:00:00",
"timeZone": "Tokyo Standard Time"
},
"location": {
"displayName": "Headquarters meeting room"
}
}

After executing the above, the response preview returned json with the following content.

"code": "ErrorAccessDenied",
"message": "Access is denied. Check credentials and try again."

Regarding the access permission, the following have been granted.

Calendars.Read
Calendars.Read.Shared
Calendars.ReadWrite
Calendars.ReadWrite.Shared

Please tell me about the cause of the error and any other necessary settings.

Answer 1

Hi @mahtycloud ,

For creating events in a user calendar by using delegated permission in Graph Explorer, the targeted user must share their calendar explicitly with "delegate only" or "can edit" permission.

To share the calendar you can follow the below steps in outlook:

In calendar Home page click on settings and select view all outlook settings

From settings select calendar ->Shared calendars ->select a calendar

Choose the user you want to share the calendar and add the permission "can edit" or "delegate"

To create event for the targeted user you can use calendars.ReadWrite.Shared permission

POST https://graph.microsoft.com/v1.0/users/{userid}/calendar/events  

Example:

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