No Nameplate?

So over the weekend I had completed the halo 2 campaign on legendary. The reason I did so was for the nameplate. After I beat the last mission, I checked my nameplates and it said I only got up to heroic, yet when I go to the campaign menu it shows I have everything soloed on legendary.
Is anyone else having this same problem?

bump

It unlocks based on achievements, and achievements registering as unlocked is bugged at the moment. When it’s fixed, you’ll get your nameplate.

achievement bug=no nameplate