Using older versions of Outlook for Mac for personal email and calendar
Hello Mitchell,
Thanks for your reply. Yes, I see it. You are not invited into that calendar event.
Given this situation, we'd like to know if you had set any automatic replies policy? Please see:
You can go to OWA > Settings > Mail > Automatic replies to check it.
Meanwhile, please change the devices like mouse, keyboard, and so on to check it.
Also, please involve your admin turn off the Exchange Online and the Skype for Business Online license under your Office 365 account in admin center, and then turn them on to check if the issue persists?
Regards,
Rudy