DLC cars unavailable


I have a question about the DLC car packs. I purchased all the Forza Motorsport 6 car packs. I tried to play the game a few days ago and all the cars from the car packs are locked and when I try to use them it says I have to buy them again. I can’t even access the 10 year anniversary pack that came with the game. Why is that? Can anyone help with this issue? Thank for your time.

might have been a temporary server issue
have you tried a full proper power cycle of your console

but have you checked that all those dlc packs are actually installed, some xbox updates delete DLC and they need to be reinstalled again