We’re using the Calendar module, pulling from O365. It works fine and pulls in the calendar entries properly if you hit “update from source” on the calendar screen. It will not auto-fresh in the background at all regardless of interval chosen.
I noticed I do not have a cron entry for Calendar at all (crontab -u asterisk -l). Furthermore, if I manually run “fwconsole calendar --sync” it says “starting sync…” and just sits there forever. I’ve seen another thread about there being problems with cron job being missing or changing format and I have “uninstalled” the calendar module and reinstalled it with no impact (to functionality, or to the missing cron entry).