sir_robert:
This does not apply when supplying 5V power using any 5V pins, as those are connected to the same 5V_USB_VBUS net as the USB-C connector. In that case, power would go out of the USB-C port, but only because you're supplying 5V to the board directly
Maybe worth noting the discussion in this topic:
According the manual and schematic (https://docs.arduino.cc/resources/schematics/ABX00162-schematics.pdf ), 5V_USB_VBUS connects directly to pins on the JANALOG and JSPI headers, however if I apply 5V to the 5V_USB_VBUS line on JANALOG the board powers up fine but I do not then get any voltage on the USB jack ie. a plugged in USB device will not see 5V and does nothing.
I also tried applying 5V to a USB audio interface device (ie. direct to its USB Vbus line) and the Q then powers up and runs fi…
Last year I bought three boards; two could be powered via USB, but one could not. Of the six boards I bought this year, I tried two, and neither could be powered.
When @easymeasuremnst_yh writes "powered via USB", they are actually referring to the board powering a USB device when the board is powered via its 5V pin.