Orion XS persistant "Disabled by BMS" error

Hi,

I have an Orion XS 12 | 12 charger I am trying to install in my truck to charge a LiFePO battery from the truck alternator.

The charger does not work, and displays an error “Disabled by remote or BMS”. I have verified the shorting block is in place and have verified continuity between the terminals with a meter. I have also tried removing the shorting wire and connecting the H remote pin to battery positive as described in Section 3.9(b) of the manual with no improvement. Removing that connection and connecting the L remote pin to battery negative as described in Section 3.9(c) of the manual causes the device to start working

The “Low input voltage” goes away when I start the engine as expected, but the engine was off for this screenshot.

I would not expect the unit to be DOA out of the box and I am sure I am missing something, but for the life of me I can’t figure out what it is. I’ll contact support on Monday and post back if they are able to help me, but in the meantime I would appreciate any suggestions y’all may have. I’d love to get this working today if I can…

Manual:
https://www.victronenergy.com/upload/documents/Orion_XS_12-12-50A_DC-DC_battery_charger/124067-Orion_XS_DC-DC_battery_charger-pdf-en.pdf