For some reason this fault was reported over a year ago, it's still not fixed, and the original report thread has been moved to the archive section.
Fanatec DD+ Xtreme not recognized | EA Forums - 8348433
This is an official PS5 wheelbase so please sort the input mapping for the DD+ Extreme wheel.
Currently the game is unplayable for any users of this wheelbase and has been for over a year.