A lot of these issues may be fixed by updating your wheelbase firmware.
It worked in F1 xxxx isn't a response. Thrustmaster firmware updates particularly address pedals via RJ12.
Latest driver is 2021_TTRS_4 and the firmware is contained under separate utility 'Thrustmaster FW Updater'. I have access to older firmwares should you wish to downgrade (tag me).
Fanatec pedals should only connect by one of EITHER RJ12 OR USB. Fanatec latest driver has all firmwares for wheelbase, motor, rim and pedals (shifter, handbrakes, etc.)
Pedals are only updatable via USB, regardless of how you use them. e.g. disconnect RJ12, connect USB, update and disconnect USB, connect RJ12. Or just use standalone on USB.
On PC, drivers must be used G923 uses GHub, G29/G920 use LGS (or GHub), G25/G27 use legacy LGS. GHub can update firmware on G920/G923 for console.
Finally, when you have separate pedals (USB) to your wheelbase, yes you must customise the wheelbase control schema with the pedals if the pedals come up (error) as no control scheme defined.
There are extensive notes over at the CM forums, but some of the links to drivers and firmware are not up to date - use the links here.
Some of the older issues on PC are also addressed (DOR issues and loss of FFB on Logitech, conflicts with Logitech / PCARS2, etc.)
EA have been poor with controller support communication this year but I'd expect most wheels to be in the same state as with F1 2021.
Fanatec CSL DD and others have issues (compatibility modes seem to be the general way forward).