Outlook Access is denied get contacts of a shared mailbox

Hello,
i have a successful connected outlook with use of the shared mailbox function.
I can get all resources like message, folder, drafts etc.

If i try to get contacts i get:
Error code 403

Full message

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

On a regular mailbox it woks as intended.

Is this a bug?
Or do i have to set access rights some where?

Welcome to the community!

Microsoft and the APIs are a bit annoying setting the credentials and permissions, so you are probably just missing a permission of the rest is working fine.
So yeah you will need to double check the permissions given to the credentials you are using.

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