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Connecting Pixhawk Cube Black with Jeti s.Bus (Futaba)

I have the issue that the Cube Black igniore the S.Bus input from the Jeti S.Bus Receiver.
This Receiver S.Bus is working perfect with a Pixhawk 1 or Pixhawk 4.
On the other side the Cube Black is working with the FrSky S.Bus.
So both devices are technical working.
On the Cube the firmware is 4.0.7.
Did I miss a setting?
Any input and / help wold be very kind.

Cheers, Markus

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