I am trying to remove 2 rights to a mailbox via powershell.  the command I am running doesn't seem to work though.

There are 2 service accounts that seem to have a deny setting on the mailbox; as shown in the screenshot.  user column is in Domain\User format.

I am trying to remove these because I believe it is causing an integration issue between Cisco Unified messaging and outlook. (New voicemails do not show up in the inbox for this one user, even though tests from Cisco UM are ok.)

Running this command doesn't seem to remove the entries I need:

remove-MailboxPermission -Identity <USER ALIAS> -User <SERVICE ACCOUNT> -AccessRights FullAccess -InheritanceType all

The remove-mailboxpermission not only removes it, but in some cases also adds a deny.  See the discussion here:

https://social.technet.microsoft.com/Forums/office/en-US/5df36b89-86fd-4bdf-b9a9-c891b151f33e/managing-full-access-permission-emc-vs-ems?forum=exchangesvradminlegacy

I tried this command and it didn't remove the deny settings:

Add-MailboxPermission -Identity <USER ALIAS> -User <SERVICE ACCOUNT> -AccessRights FullAccess -InheritanceType all

Hi BriGy,

Base on my search, if you want to remove these service account permission, you need to remove from organizational level, not mailbox level.

Please refer to the following thread, it may give you some hints:

Deny permissions for Domain Admins on mailboxes

Best regards,