What am I missing? ... Connecting Existing Z2M install to Home Assistant?

I have a work install (about a year now) of Z2M on a Windows PC. I have Home Assistant in a VM. I'd like to connect HA to the existing Z2M (yes, eventually I'll move it over but for now, no).

Per the docs, I installed MQTT on Home Assistant and added 'homeassistant' as instructed the the MQTT Listener in HA... but on a refresh of HA's MQTT screen, 'Start Listening' button shows again?... none of my ~20 Z2M devices show in HA?

I enabled Home Assistant in Settings (see screenshot).

Appreciate any help you can provide!

https://www.zigbee2mqtt.io/guide/usage/integrations/home_assistant.html

https://preview.redd.it/3sq2qgxgsvbe1.png?width=1620&format=png&auto=webp&s=427921c6915c9455bdfc10a2f7f3dc8d4b9596c1