Thrustmaster T.Flight Hotas One and attached TFRP

I’m running MSFS2020 over Steam. Already “forced off” the Steam controller prefs.
Hotas One and TFRP basically working now.

But only in 4-axis-mode (as set in Thrustmaster config panel), where it simply maps both rudder axis and throttle rocker axis to the joystick grip twist axis (making it basically just a 3-axis-controller).

If set to 5-axis mode with independent rudder pedals / throttle rocker, the setup tests and calibrates fine in Windows (and is used in Elite Dangerous), but this does not carry over to MSFS2020, where the rudder axis simply is not available in Controller mapping.

Anyone else? Any solutions already?

Thanks inadvance.