Using older versions of Outlook for Mac for personal email and calendar
Dear Michael
Good day! Thank you for posting in the Microsoft Community. We'll be happy to help!
First of all, we apologize for the inconvenience and inconvenience caused to your work. Based on your description, I've read your question carefully, given that your question is happening with several devices, this means that the problem is not just related to a particular Outlook client, because our forum lacks relevant knowledge and permissions to fix your problem, so to better help you and not waste more time, please kindly try to create a service ticket in the Microsoft 365 admin center to support > service requests through navigation, as they have more access permissions than on this forum, and professional engineers will further help you.
Note: if you are not using admin account, please kindly ask admin within your organization for help.
Thank you in advance for your understanding. Your patience and cooperation will be greatly appreciated. I hope for all the best!
Sincerely
Kerry Chen | Microsoft Community Moderator