Alarms that I share with users using CalDAV shared lists don’t sync
Article ID: 689 | Last Updated: Sun, Sep 20, 2015 at 4:46 PM
The CalDAV Spec does not allow for the alerts to be synced across when using shared lists:
http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt (see section 5.5.3)
Thus, if you have a shared list in Reminders or CalDAV in general, everything other than the alerts you create will sync.
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