Mmmm, never found this component before and I use HA quite a lot!!!
HA has moved on a lot since this was created so it is very possible it is now broken.
Try the IP address?
I currently post everything from EmonCMS to an ‘output’ MQTT topic which I pick up in HA.
I’m about to (over Christmas) move my HA install to a new 4Gb RPi 4 with an HDD. I’ll have a play with the node then.