Just to let you know, without doing anything more, it now syncs… I don’t understand but I’m glad it works.
Sync with 2 or more Dav servers
From the documentation is not clear if is it possible to sync android with 2 or more carddav servers.
@at1429 I do not understand what you mean.
You can add two accounts, one for each CardDAV server. Then you have two (or more) address books on Android, each assigned to the respective CardDAV server.
However vou can’t sync the same addressbook with two servers.
@at1429 I see. This is not an intended use case of DAVx⁵ and thus not supported by it. It would require completely other algorithms etc.