nRF52840-PDK USB not recognized

Hi,

I am attempting to run the various USB example programs on the nRF52840-PDK USB, but my nRF usb device is not being recognized (in windows OR linux device tree). Is there anything I need to change on the dev board itself? I have tried running various examples, and I don't see why I would be having trouble with the USB HID devices.

Thank you!