after updating to outlook beta, created a new profile and started fresh and it has worked for me so far. to add a new profile From Finder, open the Applications folder. Ctrl+click or right-click Microsoft Outlook, and then select Show Package Contents. Open Contents > SharedSupport, and then launch Outlook Profile Manager.

** The Outlook Beta Software Update only works if you're using the Microsoft Office 2019 Desktop version for Mac._ but not for the Office 365 users.