Can’t seem to get Lightburn to see my UV laser with a JCZ control card! It pickups my FIber with the same type of control card!
First place to check is if your OS is seeing the device.
I’d remove one of them, at least until I figured it out.
Maybe @soniclab has a good answer…
Do you hear the windows “USB device connected” sound when you plug in your machine?
I would try @jkwilborn suggestion to run one machine at once for now.
Eliminate any possible port conflict first and see if the machine is accessible at all.