Outlook Calendar not syncing on Mac but works in Legacy

mt email is synching fine. The calendar when using the app on my MacBook Air is not synching. It only works when I switch to Legacy. It's fine everywhere else. I can see lots of threads about this but they're closed. Ive just looked at the sync status and it seems to be 'working' on syncing every calendar I have in my list!

[Re-Titled by Moderator]

Original Title: Outlook Calendar not Syncing on Mac - but is syncing on iPhone and on PC. OK in Legacy