Atomstack A5 not connecting to Windows 10

2 Atomstack (A5 & A10) lasers, 2 laptops (both Windows 10).
I have in the past ran both lasers from the one laptop but had communication problems (stopping while program running).
So I have a spare laptop (Windows 10) with the second copy of Lightburn but I cannot get the A5 to run on the spare laptop. If I am remembering correctly when setting up the the Atomstack A5 on the other laptop it seems I had to change a code setting ($$??) I don’t remember the code number.
The laser cannot connect automatically and I tried connecting manually to GRBL but it just will not find the USB connection. I also tried plugging into the other USB port on the spare laptop, and still not recognizing the connection.
Any suggestions?