My Bluetooth and WiFi dongles don't light up, but they do work.
I just took a known good USB stick (disk) that lights up when plugged into my computer, and plugged it into the B2's USB port C, and when the B2 powered up, the light came on on the USB stick. If you have a USB stick that you know to be good that lights up, and it doesn't light up in the B2, then I think that's a pretty good indication that the B2 is not powering that USB port.