It's working now, not sure why. I read somewhere that version mqtt>2 requires a password. Thought that would be solved with allow anonymous users, but I put a password on it and it worked. But I restarted some services also, so I don't really know what did it.

Thanks for the reaction.
I have this option on:
- Create devices in Home Assistant using MQTT discovery. This is an alternative to Home Assistant Z-Wave JS integration
I see no homeassistant folder, but I guess for me that would be domoticz folder, as that is under name in mqtt
What I see there is ...

I have the same thing. After updating Domoticz 2024 jan and everything stopped working as my zwave stick was no longer supported.
Just install Z-Wave js ui oh and also Docker, don't worry it's really easy.
followed this
https://www.domoticz.com/wiki/Zwave-JS-UI
In the zwave js ui web interface ...