Omnibus f4 V5 receiver issue

I have an Omnibus f4 v5 and want to use ardupilot to experiment with mapping. Im having an issue getting my Spektrum receiver to connect with the Omnibus. I am binded to the receiver but no action on the radio section of Mission Planner. I plugged it directly into the DSM2 port, nothing. Plugged it into UART6. sbus/ppm, nothing. any ideas?