Server web ui phoscon ndoes not communicate conbee II

I installed HA-OS on the minipc following the instructions from the HOME ASSISTANT website
I inserted the conbeeII pendrive, the deconz addon sees it and starts but I can’t communicate with the phoscon server. conbeII works because I have another home assistant installation on PI4. at the bottom of the instructions page it talks about inserting lines of linux text to give privileges to ttyACM0 but in all my attempts it gives me an error
please help?