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Set-Mailbox Not Working
I was trying to change the MessageCopyForSentAsEnabled property for a mailbox per the instructions in: Messages sent from a shared mailbox aren't saved to the Sent Items folder - Exchange | Microsof...
John Twohig Hi, short of time here trying to go through a couple of questions so will not suggest anything else than this. Try using the M365 admin portal instead. Groups - Shared mailboxes - Sent items (edit) tick the check boxes.
Have you tried to send it through a pipe?
Get-ExoMailbox -Identity xxx | set-mailbox -MessageCopyFor...
Same result?