Kaddressbook does not load my selfhosted Carddav OR vcard files

Help
1

Hiya, new KDE user here.
I’m hosting my contacts on VPS Baikal Carddav server to sync between devices. I just installed kaddressbook and when I goto
Add Addressbook - > Dav groupware resource → enter my credentials → configure the resource manually

I end up on the Resource Configuration dialog.
Give it a name and click “Add”
Select CardDAV
Enter Remote URL “https[colonslashslash]carddav[.]domain[.]com/carddav/dav.php/”
Click “Fetch”

I get one Discovered Collection, “Contacts” @ URL. So far so good.
Click OK
I see one Server Configuration
Protocol “CardDAV”
URL “https[colonslashslash]carddav[.]domain[.]com/carddav/dav.php/”
Click OK.

nothing. it just disappears and there’s no address book.
I have tried all kinds of different configurations to no avail.
Can only figure I am missing a dependancy for Cal/CardDAV stuff?

Suggestions?

edit:
Evolution finds the CardDAV server correctly and loads them.
I exported them all as a .vcf and tried importing them into kaddressbook.
Same result. Select the file, give it a name, click ok…
Dialog disappears, no address book.

2

It does not work for me either (Debian testing, kaddressbook version 6.3.0 24.12.0). I can connect to a server and fetch the collection URL, but no contacts there. Using google.com as a carddav service (Dav groupware resource) provider.