not receiving calendar invites sent from calendar to Outlook

My work does not allow us to sync our Outlook calendar with the Apple calendar. My workaround (for years) has been to create an event in my Apple calendar and add my work email address in the "invitees" line. Previous to last week I would then receive an invite in Outlook to accept and the event would then be on both calendars.

From what I can tell, this stopped working last week. I have checked with our cybersecurity team and they said they did not block anything. I submitted a ticket to IT who searched our mail blocking app and my invites did not make it there. The IT team theorized it could be something with last week's iOS update. (I have tried test events from both my phone and MacBook Air, neither work.)

Has anyone had this issue? Were you able to resolve?

THANK YOU!