I found I had to play until it unlocked. I think the first match for me was joined in progress each time, so I had to play through the following match and wait for it to unlock after the end of that one. (Not a big deal for somebody who plays Versus
MP a lot, but I was unfamiliar with it.) Unfortunately it's too late now for the "first week", but it might be handy advice for any future event: don't leave play until you get your unlock.
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