Ok! The main thing is that davdroid works very fine. You just found another customer to the app.
Just keep up the good work and thanks all your help you provided for me!
after resetting the smartphone and new installation: still the same
two-way sync does not work
=> outlook-calender and online-calender (t-online.de) to LG-smartphone does not work
=> LG to outlook-calender and online-calender (t-online.de) does work
=> outlook <=> online-calender does work
(contacts two-way sync does work in all directions)
Please provide verbose steps to reproduce, DAVx⁵ debug info (DAVx⁵ / Settings / Debug info) and verbose DAVx⁵ logs etc as described in [READ BEFORE POSTING] What’s required to diagnose a problem.