My mistake... I'm sorry for mixing up the firmware numbers. I thought I had the latest firmware on both boards but I don't. I updated the firmware on the 6HC and it's now working.
The "L2in" node is only available on the top side of the PCB. I lifted the plastic bar off the "OUT_0 Select V" connector to get access to VB_FUSED and wired up the diode. Then replaced the plastic bar.