USB port not recognized

[KentSwan]

Using current windows 10 Pro development platform with zephyr.

Have a nRF52840DK board driving a 10pin SWD debug connector to compile and flash nRF Connect zephyr code. Have compiled and successfully run a number of zephyr apps on the MDK board but am unable to get the MDK usb COM ports to be recognized by Windows 10.

The uart0 console output is transmitted to TXD and RXD to the TTL to USB converter of the LPC11U35 chip. To verify this I compiled your "helloworld app" in a repetitive output loop, then flashed the MDK and let it run. I attach a separate USB to TTL adapter to the TXD and RXD pins and activated a COM port for it. The app was running fine outputting the expected message. I checked that VDD_3V3B required by the LPC11U35 was good. Cycling the USB-C plug goes through the motions but pops up the "USB Device Not Recognized" message.

In the past, this typically means that the VID, PID is not the generic COM port and a driver or adapter needs to be installed. Please advise ASAP.