I get no CalDAV or CardDAV service found.
How do I connect my Android contacts and agenda to NextCloud
This didn’t help: Synchronizing with Android — Nextcloud latest User Manual latest documentation
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Davx works fine. Only the naming of the contacts is a bit weird.
On my Android und contacts I have a Contacts (*email*) #17 which in fact is the synced address list.
I moved (and removed) all my google contacts to NextCloud and have them now in all my mobile phones and Thunderbird installations.
Neat