Using MS Graph to get Calendar for a resource

Question

Trying to get Calendar information for a specific users (not Me) but getting error.

Getting user detail:

Query: https://graph.microsoft.com/v1.0/Users/5e28a862-6056-44fc-b8a6-f3cdbdd47fcb

Result : gave me detail about this users without any problem.

Calendars Query
https://graph.microsoft.com/v1.0/Users/5e28a862-6056-44fc-b8a6-f3cdbdd47fcb/Calendars

Error:

"ErrorItemNotFound",
        "message": "The specified object was not found in the store."

Answer 1

Hi @virginie Marcoux

You can't retrieve another user's calendar information unless the target user has delegated a calendar to you. According to the Graph API, there are two ways to solve this problem.

The first way is to create an application in the Microsoft Entra ID and grant the application permission Calendars.Read, and finally get a token through the client credentials flow for access.

The second method is the way you are currently using to access another user's calendar through delegated permissions, but this method requires the accessed user to share the calendar with you or delegate it to you.

For more information about how to share or delegate a calendar:

https://support.microsoft.com/en-us/office/calendar-delegation-in-outlook-on-the-web-532e6410-ee80-42b5-9b1b-a09345ccef1b#:~:text=1%20In%20Outlook%20on%20the%20web%2C%20select%20Calendar,sent%20to%20you%20and%20your%20...%20See%20More

For more information about how to get shared or delegated Outlook calendar:

https://learn.microsoft.com/en-us/graph/outlook-get-shared-events-calendars

Hope this helps.

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