Omnibus F4 - Arducopter - no TX Signal via S-Bus and PPM

Hello everyone,

Today I flashed my omnibus F4 Flight Controller with the Arducopter software.
It worked well, it connects to the Mission Planner, and the sensor movement works as well.

Now I have connected the receiver and have followed these instructions.

I wanted to connect now a Frsky xm + receiver over Sbus. It is properly connected to the remote control, but nothing is displayed in the Mission Planner when setting up. I then tested it with a PPM receiver, but again nothing is displayed.

Connected via the J7 pin RX in.

Does anyone have an idea of ​​what I did wrong and how can I get the recipient to work?

Best ragards