how to play poe2 on xbox if i bought in steam

how to play poe2 on xbox if i bought in steam?

You have to buy the EA supporter pack on the console as well.

I bought it on Xbox as I wanted to be able to shared screen co-op, was expecting to be able to install it on the laptop from Game pass.

Nope. There is no PC client under Xbox.

Presumably it won't matter once it's released free to play, but to gain access to the game client you need to buy the EA supporter pack on each of the 3 storefronts: PC, Xbox, PS5.