Set this
to false hereOn /homeassistant/zigbee2mqtt/configuration.yaml
If you fill out the configuration file via the addon, it grays out the manually configured fields.
From another thread I replied to
For Onboarding
- Place the Z2M in the sidebar to assist with onboarding
- Leave these fields clear in the Z2M config
- Start Z2M and then click the SideBar link, you should see the onboarding screen.
- Fill in your config data there.

