Same issue here.
Device:- Fanatec 15Nm DD+ GT Extreme Wheel
It's an officially licenced PS5 wheel so EA WRC need to do better with this, especially as Fanatec sponsor for the WRC
The base is incorrectly recognised as a 5Nm/8Nm GT DD Pro Wheel.
Please understand the difference between the wheel bases as they are totally different.
CSL GT DD Pro 5Nm/8Nm - Works fine.
DD+ GT Extreme 15Nm - BROKEN
Throttle/Brake work, and steering recognised OK, but.....
No Force Feedback
No menu control (need to use PS5 controller for menu work)
No paddle shift
No handbrake
Buttons show up in the calibration tab when you press them but they don't register as presses in game and you can't map them.
This happens in each of the 3 playstation modes this wheel has.
My Xbox WRC wheel works in PS4 compatibility mode (light blue) light on wheelbase, but I first have to delete the other wheel profiles that were recognized in the other modes.