I'm trying to figure out how to enable USB VCP functionality on my STM32F103-based Blue Pill board. In following

As of now, I've tried the following potential fixes from (ref)

This was never going to work, as the CANbus pins I'd been trying to use (and left plugged in) share functionality with the USB port. The VCP immediately showed up and worked after I unplugged the breadboard wires I'd connected to PA11 and PA12. I feel dumb, but relieved, right now.