Waveshare 2xNVME HAT not showing up (PCI-Express issue)

Tried rescanning:
echo 1 | sudo tee /sys/bus/pci/rescan

This did not make the nvme drive appear (sometimes just 1 is detected on boot).

Yes you just need to power this thing with another device’s 40-pin header for 5V. Still connect the ribbon to your Radxa device.