So I checked this out with 343 and you didn't meet the criteria in order to get the nameplate unlocked in afraid.
The nameplates are manually granted by 343, unlock waves will probably start at some point this weekIt's been over a week now, and still no nameplate... why is it so dificult to just pass it to everyone that filled the requirements? I guess its the same as with some of the achievements not unlocking for some of us... they're just left like that and wont ever be adressed...
According to their records, you only did 1 par time on snowy maps and and only completed 7 MM/FF matches
So what, Was it par time or par score?
The dev post on steam states beating par score but apparently it was supposed to say time?
At this point they should just release it to everyone that played at all during the period if no one can agree on what the requirements were