Really just came here to say Thank you for posting this. Really helpful to have this overview. It’s very confusing.
This one seems tricky. For my setup: running coolwsd ‘natively’ on Debian from .deb packages (i.e. not in docker), on the same server as nextcloud, I had to put in
127.0.0.1,11.22.33.44
Where 11.22.33.44 is the public IP of my server. Despite them both being on the same host it appears that this is the IP that the other sees. Also note that there’s no space around the comma.