I recently bought a Conbee II as well and had some troubles forwarding it into the marthoc/deconz docker. First I started to add a new docker in unraid completely from scratch, since it is not available as a community app. These are my settings for the docker container:
The deconz gateway variable has to be a "device" as config type. Keep in mind that there are different device names for the gateways:
Conbee I = /dev/ttyUSB0 (default)
Conbee II = /dev/ttyACM0
Raspbee = /dev/ttyAMA0 or /dev/ttyS0
Be sure to dial out any serial devices as mentioned in the docker instructions before forwarding the device:
sudo usermod -a -G dialout $USER
Starting the docker with these settings worked perfectly for me. The Conbee II will be identified correctly.