I pre-ordered Endwalker, started playing it, now it's saying I don't own it.

[Vandrak]

Put the cd key in. There's 2 keys for some reason, pre-order and then endwalker.

[Capotano]

Where do I find the key?

[Vandrak]

Where do I find the key?

I used steam. If you did too, right click ff and choose manage.. cd keys.

[ijuakos_xqwzts]

Put the cd key in. There's 2 keys for some reason, pre-order and then endwalker.

I suspect because it's logistically easier in the use case where someone pre-ordered, got the key (because there are in-game items that you are awarded immediately), and then cancelled their pre-order. Those who cancelled would have not received the subsequent key to unlock the full expansion.