Facing access denied error while accessing emails from shared maibox through graph API

Question

Hello

I want to access a shared mailbox with Microsoft Graph. I am currently trying to get a response with Graph Explorer. What I found so far to access a shared mailbox is the following GET request: "https://graph.microsoft.com/v1.0/users/{sharedmailboxmailaddress}/messages" as a respond I get:

{ "error": { "code": "ErrorAccessDenied", "message": "Access is denied. Check credentials and try again.", "innerError": { "date": "2020-08-28T08:39:00", "request-id": "ba9bddb6-601e-4d37-a787-3e2e474ce72b" } } }

I have provided Following API delegated permissions - Mail.Read, Mail.Read.Shared, Mail.ReadWrite , Mail.ReadWrite.Shared , Mail.Send , Mail.Send.Shared.

How should I resolve this issue or what extra permission should i give ?

Answer 1

Hi @Siddhesh Gholap

It is not possible to directly list all emails in a shared mailbox. When the target user shares their mailbox with you, only the Inbox folder is shared by default, so you can only retrieve emails from the Inbox folder of the shared mailbox.

GET /users/{sharedmailboxmailaddress}/mailFolders/{id}/messages

If you want to access emails in other folders of the shared mailbox, you need to contact the target user and ask them to share the other folders with you in Outlook.

Hope this helps.

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