DLC Not Working??

Soo i know alot of people have the same issues but i tried them all

Beating chapter 6 and the game recognizes me in chapter 7

Reinstalling the whole game by deleting the saves (i backed it up) and the game itself before reinstalling it

Changed the in game time

But still nothing, what do i do?? I heard some people say you have to u lock byleth first but i dont know when you unlock him or even where. And some even said unlock Anna first which i seriously am not sure

Edit: i know i got the DLC cause i remembered getting the DLC item boosts