FrSky Archer R6/ Pixhawk 4 Connection

Hello Community,
I have a question regarding the Archer R6 Receiver. I bought it in a bundle together with a Pixhawk 4. I already binded the Archer R6 with my Taranis X7 and that worked just fine. I connected the Archer 6 over the first three pins to the SBUS RC port of the Pixhawk.
Now QGroundcontrol says it detected zero radio channels and I need four to operate. I already tried this solution: Detected 0 radio channels. To operate PX4, you need at least 5 channels but it didn’t work.
This is my first timebuilding a drone so I hope you can help me out if I made a mistake with the wiring. I sent you a Picture of my setup.