Fiber ports on 501E - no link lights

Attempted an ISP cutover tonight on an HA pair of 501Es

The goal was to swap the ISP connection from port 1 to port 9.

The gate recognizes the transceiver and doesn't complain about incompatibility. It's an actual Fortinet SFP.

Test on the fiber line coming in are good, but when plugged into our port we just never get link lights. ISP sees nothing connected. Is there some secret thing I don't know about that I need to do to turn these ports on? It's an HA pair and no link on either device, so that kinda rules out bad SFP, or bad patch cable, because it's unlikely we would have a dual set of broken parts, but still tried swapping em out, just for funsies.