I an trying to figure out why I can’t get the Calendar on my new Samsung to sync, I’ve tried a number of apps and am getting more or less the same result.
Testing DAVx5 (which is reported to work with Egroupware) I was told:
When DAVx⁵ lists the resources, it queries the principal, which returns 403 in your case: 403 Forbidden: no app rights for ‘users’, so DAVx⁵ does not get the address book or calendar home-set, and thus can’t list address books or calendars; queries the known home sets, which in your case is only the address book homeset, and lists the address books.
Looking at the php files I find that some are owned by root group root and some are owned by www-data group www-data. I’ve never had a problem with this before, but I haven’t tried to set up a sync for a long time…
I have discovered that an old app aCalDav does sync the calendars, but it’s no longer being developed.