USB power not powering modem

I’ve got an OVMS module with the 4g module added. The module itself is stamped OVMS 3.2 but I have updated the firmware with the 3.3 edge firmware.

I’ve tried powering the OVMS with a 5v & 9v wall charger as well as an Anker Powercore usb powerbank, however when I try to bench test the device I consistently get a “poweringon” in the modem status and messages about gpio low and high in the overall status

Any ideas? It seems to work via the OBD2 port but not via USB.

thanks