Hi,
I try to use SendExhangeMail activity with a user who is connected to a shared mailbox. It keeps giving the following:
“Send Exchange Mail Message: No mailbox with such guid.”
This error is commonly caused by an unlicensed mailbox account. Check that all of the migrating mailboxes are licensed in Office 365 first.
If a mailbox account has been assigned a license and the error persists, it is usually caused by a non-Null value in the “msExchMailboxGuid” attribute of the mailbox account.
I have had the same issue
I was able to read emails, but not to send from shared mailbox.
After a personal mailbox was created for my user, I could send emails from the shared mailbox