So, for the record I have the below in my config file, but to be honest, I think this is now taken care of by joleys integration itself through HACS. You do need to have the Niko Hobby API set up with Niko (https://mynikohomecontrol.niko.eu)
nhc2:
host: 192.168.107.3
username: hobby
password: !secret nhc2_password
port: 8884
The WebUI of the NHC is just that, it’s nothing to do with HA.
NHC installations used to allow you to connect to them directly via http, and see various notifications but they’ve since stopped that. If you enter the serial number (of the connected controller), you just see a page that says access is denied, so no real value in doing it!