Pixhawk4 Mini - Doesn't recognize battery

Hardware: Pixhawk4 Mini, Holybro PM02 Power Board, 3S Lipo to PB and ESC, 2S Lipo on Servo Rail w/5.1V regulator, Eflite Timber w/stock ESC, Spektrum Satellite RX

Issue: I set up the battery configuration in QGroundControl it never seems to recognize the battery connected to the PB. When I try to calibrate the ESC, it says “timeout waiting for a battery”. Also, when in the flight screen (connected to FC via USB), it says Battery “OK” but has no voltage or current measurements.

So I can’t calibrate the ESC and the aircraft never allows arming due to battery error.

Does anybody have any suggestions?