redeemed game code that says it only works for series x/s, not on my xbox one

If your game code only says it is for Series X|S then it will not work on an Xbox One X. The One X was the revised Xbox One hardware released in 2017, it's not the same as a Series X.

I am thinking of buying hogwarts legacy as a digital game but it is sold out for Xbox one so should I buy the Series X game and put the code in the Xbox one Store?

No. The series X/S version of the game will only work on the Series X or S.

The only way that would work is if it's a code for the digital deluxe version of the game (which comes with both the series x/s and xbox one versions of the game)

You would have to check if the game was released on older gen or not. If it says it's only for Series S/X, then no. If it says it'll work on both the One and Series S/X, then yes.

A game can be optimized for the Series S/X but still work on both, but not always.

There is no xbox one series x

The series consoles are a completely separate from.xbox one

You just Confuse people by saying it

Ita xbox series s /x thats it

When talking about system requirements

Xbox one games work with xbox one games there is no requires xbox one s or x

It's just xbox one

Now with series games physical games are only compatible with series x

This does not include xbox one x or s

Digital games are compatible with series s or x but must be stored on nvme storage card or internal drive

If it's only for a Series S/X, it will not work on a One. One games will work on a Series S/X.