Rated 5 out of 5 stars

One more note, maybe it will help:
If I select the item "Refresh Calendar" to "Manually" in the calendar settings, the synchronization works. If I choose "Every 30 minutes" or "Every 60 minutes", the sync doesn't work.

This review is for a previous version of the add-on (102.0.0).  This user has a previous review of this add-on.