That's because the key is assigned to Buck's email account.
Try this:
Register account, log in, then visit
https://beta.firefallthegame.com/invites/accept
Enter the key.
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L2IO1-C7RUO-UIANE-YHJLW
https://beta.firefallthegame.com/login?code=L2IO1-C7RUO-UIANE-YHJLW
Hope it works :)
First to enter win.
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