Using older versions of Outlook for Mac in business environments
Indeed the mentioned solution also works for me. turning off the "Sync with Microsoft Cloud" allows you to change the sender name.
On the other hand, a resolved problem causes a new problem to appear. When you do this, it is no longer possible to pin an email to keep it at the top of the inbox.
This function is very useful for me. So I have to choose between the "pin" option and the "change my sender name" option.
On the new version of Outlook Mac, it is also not possible to set up rules for IMAP accounts.
It's so frustrating that Microsoft isn't doing anything to fix all of these issues.
If anyone has a better alternative or solutions for these problems, I'm interested.