Pixhawk 4 Telemetry Issues

I am currently involved in a build that is using the RFD 900X, and am looking for some potential insight into the issues we may be having. We are running the Pixhawk Cube with QGroundControl, and haven’t been able to find a pinout that can resolve the issue with the necessity of multiple RC IN ports. The system itself is running, but we are unable to get telemetry to register in QGroundControl. The transmitter and receiver are connecting to each other, and are giving off solid green lights,

Any help would be very greatly appreciated.