Using older versions of Outlook for Mac in business environments
Hi Ant1189,
Welcome posting in the forum.
Given your situation, we suggest you can try to create a new profile in Outlook, test if same issue happens. For your reference:Manage profiles or identities in Outlook for Mac. Also, you can go to Outlook Web App.
If issue persists, please kindly capture the screenshot of issue for further analysis.
Regards,
Grace