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I let my little bro use the U-passplay or whatever, because I thought it was for multiplayer stuff and he likes that way more than me. But now whenever I try to use the Kenway's fleet thing in my boat, it says I have to buy a passcode.
From what I understand, this is just a sort of minigame within the game, like the Assassin missions were in the last? But I've been locked out as (presumably) some sort of anti-used game measure?