Can't open Shared mailbox on mobile device, works on every other client.

Anonymous
2021-06-15T13:20:37+00:00

We want to share mailboxes with 'Least privilege' principle.

So when creating a shared mailbox instead of making users Owner we want to assign only permissions on the necessary folders.

With a PowerShell session to Exchange Online we make the following changes:

Add-MailboxFolderPermission -Identity SharedMailboxTest:\ -user ******@contoso.com -AccessRights Reviewer

Add-MailboxFolderPermission -Identity SharedMailboxTest:\Inbox -user ******@contoso.com -AccessRights Reviewer

This works fine with Outlook Web App and Outlook desktop client. We can add the shared folder and read the messages.

But when we try to add a shared folder on a Outlook Mobile client we get an error:

Authentication failed

That didn't work. You may not have the right permissions to add this mailbox or this mailbox doesn't exist.

Also added permission directly on the mailbox:

Add-MailboxPermission -Identity SharedMailboxTest -User ******@contoso.com -AccessRights ReadPermission

But that didn't make a difference.

It must be possible to delegate folder permissions. It works for default clients, but it refuses to work on mobile Outlook unless I give the user Owner permissions, but that is not 'Least privilege'.
What I'm I missing here or did I stumble on a bug in Outlook Mobile?

(It has to be Outlook mobile client on cell phones)

Outlook | Windows | Classic Outlook for Windows | For home

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  1. Anonymous
    2021-09-13T12:13:53+00:00

    As of this Morning September 13, 8 a.m. Eastern, I was able to add 2 shared mailboxes successfully in Outlook app on Android. With any luck all of you will have the same result today.

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  2. Anonymous
    2021-09-11T17:42:53+00:00

    I just tested and you're right, still broken.

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  3. Anonymous
    2021-09-10T15:47:24+00:00

    I have same problem.

    I try install old version of Outlook apk. But problem still persist. I try disconect from Intune and configure Outlook, but problem still persist.

    The shared mailbox in the mobile app worked properly. Unfortunately, I needed to test something, so I deleted my Outlook data, then re-added my account, and I can't add a shared mailbox in any way.

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  4. Anonymous
    2021-09-10T11:51:57+00:00

    I have exactly the same issue, also got redirected to Mobile support but after providing all the info to them no reply at all.

    I've also added a new shared mailbox and this also has the same symptoms :(

    I backed up the mail in the shared mailbox and deleted it and recreated it but still no.

    I also tried connecting to the shared mailbox via MAPI as a workaround but that just immediately said unable to connect with the server.

    If anyone has a resolution to this please share as I'm stuck.

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  5. Anonymous
    2021-09-10T10:28:28+00:00

    Same problem for our company

    I already tried to remove/add my account on the app completly which did not work.

    The shared mailboxes whicht were working fine before can now not be added anymore.

    iOS Version: 14.7.1

    Outlook App: 4.2135.0 (updated on 09.09.2021)

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