PINE64

I can add my Nextcloud Account in Prefs, and I will see my files in Dolphin or in Konqueror. But Phonebook will not sync any contacts. And in Merkuro Calendar and Merkuro Contacts I can set up DAV connectivity but it will throw an error.
Are there methods to make Nextcloud connectivity a little more useful, or is DAV mostly disfunctional these days?

still not working. Merkuro asks for credential many times but throws an error message when finally trying to connect.

nobody using Contacts or Kalendar or Merkuro?

with Beta 15 RC5 I can set up a Nextcloud account, but adresses will not sync to phone book and Merkuro does not connect at all.