Set-Mailbox fails, update “Send on behalf” exchange 2010, recipient isn’t the expected type.
Issue:
When update “sent on behalf”, you may face error “recipient isn’t the expected type”
Cause:
“Send On Behalf” access has not been removed while disabling the mailbox, they accounts are still pointing to shared mailbox, it usually happens with migrated exchange.
Solution:
Go to AD Users & Groups
Select email account having problem
Click properties and select Attribute Editor
select PUBLIC DELEGATES and remove the mailbox account you seen in the error.