For syncing Nextcloud (or other CalDAV) tasks with DAVdroid, you need OpenTasks, see here: https://www.davdroid.com/manual/introduction/#c215
Does that help?
after installing an OTA OS update for Android, instead of syncing my contacts all I get is “Fehler beim Vorbereiten der Synchronisation”.
Here’s the error dump: http://paste.in-ulm.de/?eb09e69f71fdbf17#ibnHpH8sCnOxLgpkjmQ0ZFUPtcB48zq9Vs4zODQA/nY=
did you get the DAVdroid notification¹ that your system has been updated? From which version did you upgrade to which one? Or was it a small security update?
¹ “Android version updates may have an impact on how DAVdroid works. If there are problems, please delete your DAVdroid accounts and add them again.”
Nope, I wasn’t notified by DAVdroid - possibly it was a too minor upgrade though it went the normal OTA upgrade way.
Will recreate my account, thanks for the help.