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get the ubisoft store copy of the game
beat the first mission
multiplayer should unlock shortly after
same should happen with the steam version when you play
the reason this happens is (and this is my assumption so don't fully take my word on it) ubisoft messed up and doesn't give proper "permission" to your account to access multiplayer because it doesn't recognize steam copies properly.
i take it they never bothered fixing it and kept it that way (probably for more money because it's ubisoft)
if you'd like you can copy and paste this message to people who need it and haven't solved this problem.