Hi All
i am using exchange 2016 hybrid environment, i have created remote shared mailbox in onprem. i have provided GrantSendOnBehalfTo Permission to one of the user to this shared mailbox using the below syntax but user is getting the below error. its working from web mail. please guide me
Set-Mailbox -Identity "sharedmailbox@contoso.com" -GrantSendOnBehalfTo "user1@contoso.com"
Your message did not reach some or all of the intended recipients.
Subject: test
Sent: 6/20/2021 11:00 AM
The following recipient(s) cannot be reached:
User2 on 6/20/2021 11:00 AM
This message could not be sent. You do not have the permission to send the message on behalf of the specified user.

