Quote Originally Posted by Alberel View Post
Sorry but you can't 'transfer' your game account between platforms. The account itself is platform agnostic; you just added a PS4 key to the same account and bought the PS4 expansion. Your Steam key for PC is still registered to that account.

@OP: If you bought the game on Steam originally then I believe you are restricted to buy all future expansions for the PC platform via Steam as well. You can still buy console versions elsewhere to register to the same account if you wish but any non-Steam keys for PC will no longer be compatible. This is why most people advise not buying the game on Steam, but I suppose that's not helpful to you now.
Semantics.

The point is my PC purchase transfer over just fine to the PS4 without having to buy another key.