Matek F405-ctr Issue with cam gimbal

HI guys. I am running an f405-ctr with 3.6.8. Everything all setup except for a camera gimabl. I can get the correct output out of ch5 and s5 pin but I get nothing out of ch6 and s6.

For what its worth on inav I have seen some custom firmware out there for this. Betaflight reportedly seems to not have problems.