Due to some recent problems mit deCONZ binding, I wanted to give zigbee2mqtt a try. Zigbee devices (2 Lidl Livarno Home LED floor lamp and 1 TRADFRI remote control) appear in my INBOX in OH.
I was struggling with something similar.
The HA device detection in the mqtt-binding does not properly setup the lights (had this with a tuya floodlight and the Livarno E14 bulbs).
Create it manually and it will work. @Gewuerzwiesel has just given some very useful configuration details in this post.
Did you create the thing and save it first? After this you should be able to edit it again and do enter your adjustment.
Did you do a copy and paste? Then maybe the structure of the yaml is not proper - spaces e.g. matter.
Ok, got it. You need to create the thing from scratch as a generic mqtt thing. From what I saw you are editing the thing created by the HA discovery. This will not work.