I am experiencing similar issues with my MacBook Pro. I am close to going to buying an inexpensive Windows Laptop specific for CNC work, or just as well look for a USB-C to Type-B cable. Did you get the cable? Did that resolve your issue?
Hi all, I use my MB Air all the time for this including an old 2011 air. USB-C adapter on the end not the manifold style with multi-ports. I have the apple version and an amazon version. Did you make sure you downloaded the driver for mac from easel?