USB 3 Front Panel headers on X10SLM+-LN4F

Is there something I need to enable to get this to work? A jumper or BIOS setting? I can’t seem to figure it out. Can’t find anything on this anywhere. Thought I’d post here given the popularity of this mainboard here.

There’s a [slim] possibility it’s a bad header, but it’s a reputable ebay seller and everything else is new.