What platform you're playing on: Windows 10 - Steam.
What your PC setup/build is like (graphics card, processor etc.): OS - Windows 10 64-bit, RAM - 16 GB, CPU - Intel i7-8700 @ 3.20 GHz, GPU - Nvidia GeForce GTX 1060 6GB
If you're playing on PC, state whether you're in 2D or VR: 2D
Whether or not you have any non-standard peripherals connected, like steering wheels, gaming mice etc: Thrustmaster TX Racing wheel + T3PA Pedals
Whenever I select the Rallycross Career mode. It only gives me the option to choose from the 3 RX Supercars I own. My garage has the RX2 Fiesta, Group B RX cars, Super 2000 cars and the 2019 RX Supercars.