Can you try with nightly build ? Or at least with demo.sogo.nu ?
This is issue should be resolved but I didn't had the time for testing this.

Sebastien

I would try using the demo site. Unfortunately, right now (Mi 30 Aug 2023 03:48:00 UTC), it seems to be down (see screenshot).
I can also try with nightly - will take some more time though - or I can wait for the next release?

demo.sogo.nu.png (199,608 bytes)   

demo.sogo.nu.png (199,608 bytes)   

https://demo.sogo.nu working again, I tried, but in vain.

I added a contact to the sogo3 user, but that did not get displayed in the Contacts app.
I added another contact locally, but that did not get uploaded.

Hi @Waschbuesch,

After some tests, I can add/edit/remove contacts on demo.sogo.nu (check screenshots in attachements).
Synchronization can take some time but this is related to Apple's internal mechanism.

Sebastien

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Capture d’écran 2023-09-06 à 10.50.47.png (35,514 bytes)   

It still did not work for me, I then tried creating a new macOS account and created the CardDAV account there.
With that, syncing worked! I have no idea why, but for now, I guess you can close the ticket.

Thank you for your help!