External users can't access data via *dav

as i’m new here, first off all a big HELLO to everybody.

On my installation i’ve setup imap user authentication for the users of our organization. Everything is working like a charm, except that the imap-users can’t connect to their calendars via caldav nor to their files with the desktop app (webdav).

There is a similar issue regarding ldap users in under: sharing-backend-for-principals-not-found-ldap-backend/4445

Unfortunately i can’t post error logs, because i’m not allowd to put more then 2 links, even if there aren’t links in the log.

What you linked referred to shared calendars. For you it would be the normal calendar. Can you try again to post your logs, it should be possible now (if not put them on pastebin).