Can't get FrSky Passthrough working (4.0.5)

After it worked on my initial setup I moved on to the next copter, it uses a R9M Mini OTA receiver.

I connected the inverter and enabled Frsky Passthrough, I get one new sensor, GPS. Has anyone an idea why only this one?
Maybe update the receiver?

Thanks a lot!!! Work with TX an Rx connect! Baud rate 57 protocol 10 serial options 0.
Yappu work fine but radiomaster discovered only GPS coordinates. I don’t know how, but yappu works well.

Thank you, I tested yappu after your message and it works. Did not try it because I only saw one sensor.