Well it could allow to remove manually instead of readding account 😉
Anyway I managed to so.
You can leave this thread open for later suggestions.
DAVdroid seems to connect sucessfully to the server, since it detects my calendars as well as the address books. However, the DAVdroid account does not show up in the contacts app, nor in the calendar app, nor in the OpenTasks app.
I do not get any error message when syncing manually. Diagnosis information:
Is this an actual issue or do I miss something really basic here!? Any advice is appreciated!
Did you select the collections you want to synchronize in the DAVdroid account? If you tap on a calendar/address book in DAVdroid it will be selected and a checkmark appears.
Wow, did not think it would be that basic. Thank you, that did the trick.