Thanks a ton!!!
I put the cables back in their two original HDMI ports (port 1 and 2). I then swapped 1 & 2, instant sound.
I'm a bit confused on why it didn't work with port 3, which is the only one marked HDMI ARC, but I no longer care since the ceiling speakers are working!!!
DW, DD (sometimes), DS (sometimes), 2 camping poodles
2017 Forester 3011DS