SOLVED Nextcloud and macOS contacts.app

[christiaan]

Has anybody got Nextcloud's contacts app to work successfully with macOS contacts.app? I'm finding it syncs just once, in one direction (Nextcloud --> Contacts.app), then that's it.

[christiaan]

Found this unresolved bug from 2018 which describes the problem I seem to be having:
https://github.com/nextcloud/contacts/issues/575

And this possible fix?
https://help.nextcloud.com/t/high-sierra-address-book-does-not-sync/23007/19

[christiaan]

My problem seems to stem from incorrectly thinking Nextcloud calendars and contacts use Push, but they use Fetch and the default schedule on Macs and iOS devices is 15 minutes.