Ventura not syncing exchange/outlook calendar entries

I had this same issue when I upgraded to Ventura. I found there is a process called exchangesyncd that controls the sync with the calendar app (and probably other things like contacts, notes, etc). The point is that I was able to go into Activity Monitor (use CMD + Space and type activity monitor in the search bar), and then type exchangesyncd in the search field within Activity Monitor, do a force quit on it (select the process on the list and then hit the X shaped button on top then force quit). It will take several seconds for the process to restart by itself, and then a few more seconds for the sync to start working on the calendar app. It took maybe 20 seconds in my case to start seeing the calendar sync again.

I remember back in Monterey I had this issue pop up every now and then. A full restart would fix it, but then I found a process called calendaragent and I would do the same thing I described above. Calendaragent is now gone in Ventura, but my guess is that exchangesyncd replaces it, as it behaves the same way. Hope this helps out!