CmdID

CmdID / PowerShell / Cmdlets / Remove

Remove-MailboxIRMAccess

Use the Remove-MailboxIRMAccess cmdlet to allow (unblock) delegate access to IRM-protected messages in other mailboxes (shared mailboxes or user mailboxes where delegates have Full Access permission). Exchange PowerShell reference

From the Exchange PowerShell reference 2 parameters Its page in the reference

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Parameters

2 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the mailbox that you want to modify.
-UserThe User parameter specifies the delegate who is no longer blocked from reading IRM-protected messages in the mailbox.