I have tried swapping around the expansion cards so it appears to be the slot. I’m getting the slot numbers from Expansion Card Slot functionality on Framework Laptop 16 so I think that’s correct and should allow me to charge from it.
Does anyone have any idea what could be broken here or any suggestions for things to try before I do a support query?
I would definitely contact support about the charging issue. Those two ports are the ones they primarily suggest connecting charging up to. Each side has its own controller, the controller on that side of the machine may either be corrupt or something has failed and is causing it to not accept the charge. Support will have the best course of action to take and likely wants to know more information so they will have an idea of what to go off of should the issue come up again for other FW16 owners.
Thank you for reporting it and let us know how it turns out.