It might need a driver to talk to LightBurn. It’ll usually be an FDTI driver, but if it’s an Arduino clone, it might be using the cheaper CH340.
The FTDI driver can be installed with LightBurn at the end. The CH340 drivers are here: https://sparks.gogo.co.nz/ch340.html
(both of these are chips that handle USB to serial communication with small microcontrollers - these chips and drivers are how the micro’s talk to your PC)