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Either tha game has something built in, or Square Enix has a "login through Steam" to verify that you own the game. In this case, you simply don't need a key.
If they insist on one of their product keys, you can probably get it from Steam by right-clicking on the game in your library and selecting "View CD key" from the menu.
I also just went into the game and linked my square-enix account so I'm guessing that's it.