If it helps, I’m hitting the same issue. There doesn’t seem to be a usbmodem or usbserial port established, but the Mac does see the USB connection in System Profiler:
USB Serial:
Product ID: 0x7523
Vendor ID: 0x1a86
Version: 81.31
Speed: Up to 12 Mb/s
Location ID: 0x00100000 / 1
Current Available (mA): 500
Current Required (mA): 98
Extra Operating Current (mA): 0
I think it may be the usb/serial chipset the TwoTrees laser boards use. It seems to be a common chip for arduino style dev boards. Digging into the usb vendor ID yields this thread:
Mac OS, Linux driver for CH340K · Issue #3 · LilyGO/LILYGO-T-OI · GitHub and this potential driver for the CH*** series usb serial chipsets: GitHub - WCHSoftGroup/ch34xser_macos: MacOS USB driver for USB to serial chip ch340, ch341, ch342, ch343, ch344, ch9101, ch9102, ch9103, etc
But… I must admit as I use this Mac for my business I’m not keen on being the test subject for taking a chance on a random driver 