The team at Hell Hades try to keep an updated list of active and inactive codes, and this can be found at https://hellhades.com/raid-shadow-legends-promo-codes/

Note that there are a couple of different types of promo codes, such as ones for everyone, and ones targetted specifically for new players.  The latter codes won't work for established accounts, even if they are flagged as active, as they check to see if the account is new

And usually, the "active" ones for everyone don't last for very long. There's no official time limit on them, but usually within a month, they are gone forever

I would like to know where the active promo vodes are too cause every one I put in even my Amazon prime promo drop says it's inactive code