Re: DLC Cars not showing up as available to purchase in Garage

from Xbox support agent : "this means that it's an in-game DLC issue that only the game's developer can resolve. At the moment, we at Xbox Accounts and Subscriptions have already reported the situation and we'll just have to wait, my friend! However, for more help, you can try contacting the game developer to request an update on the DLC issue and we'll get it resolved."