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Don't sign in to your psn account. First you have to start Black Ops 3 and press "X". Your profile will be loaded. Then you have to click "Play online" and you will be logged in to your psn account. Now you can play.
got it working, i think.. deleted update and just used the fix with no update. weird though as i was entering a match i got a 800 error code. it still got to play been playing since then.