List Master Categories for Shared Mailbox using Graph Rest API

Diksha Yadav 61

I am getting a Forbidden - 403, when I am trying to access GET /users/{id|userPrincipalName}/outlook/masterCategories for a shared mailbox. I have given the Mail.ReadWrite & Mail.ReadWrite.Shared permission for it too.

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

Matt Zukowski 0 Reputation points

2023-10-20T19:39:03.3+00:00
I'm running into the same problem, but only when trying to get categories for a shared mailbox.

GET /me/outlook/masterCategories works fine, as does GET /users/{MY UUID}/outlook/masterCategories when {MY UUID} corresponds to myself.

GET /users/{SHARED MAILBOX UUID}/outlook/masterCategories does NOT work. I get a ErrorAccessDenied error despite having granted all of the following permissions:

'email', 'IMAP.AccessAsUser.All', 'Mail.Read', 'Mail.ReadWrite', 'Mail.ReadWrite.Shared', 'Mail.Send', 'Mail.Send.Shared', 'MailboxSettings.Read', 'MailboxSettings.ReadWrite', 'openid', 'profile', 'User.Read'

1 answer

Ab-8756 800 Reputation points

2023-08-24T17:44:35.8833333+00:00

Hello Diksha Yadav,
Thank you for reaching out to this Q&A Forum.

The necessary permission for accessing this endpoint is MailboxSettings.Read. After conducting tests with various users on my end, I have consistently encountered the same error. Currently, I am only able to access my own user information. It appears that there might be an issue associated with this particular endpoint. As it falls within the v1.0 version, I would recommend you try adding MailboxSettings.Read first and if that doesn't work, please open a support ticket.

Hope that helps.
Thanks.|
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Diksha Yadav 61 Reputation points

2023-08-24T18:08:15.6533333+00:00

Thank you for your response. I have added the MailboxSettings.Read too. I am able to get the response for GET me/outlook/masterCategories but it's throwing this error when I am trying to access the same thing for a shared mailbox email id in this format GET /users/{id|userPrincipalName}/outlook/masterCategories

Ab-8756 800 Reputation points

2023-08-25T18:52:19.67+00:00

Hi Diksha Yadav,
I have done some more tests from my end today, and it's throwing the same error for most of my users. This issue needs deep investigation by the Engineering team. I strongly suggest you open a support ticket with Microsoft Graph API Team.
Hope this helps.
Thanks.
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List Master Categories for Shared Mailbox using Graph Rest API

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