Nightfall Helmet (How do you unlock it?)

So I have the nightfall armor… And I have watched all the nightfall episodes and it says I have unlocked that reward; however, in Halo 5 it doesn’t seem to care that I should have it. Anyone have this issue? Anyone know how to fix it? It’s one of 4 helmets I don’t have.

Nightfall
Athlon (HCS)
Helioscrill (WIP)
Mark VI (Scarred) (Also WIP)

For the helmet you must watch the first episode of HALO NIGHTFALL: SECOND STORY. Just so you know I believe episode 1 of NIGHTFALL: SECOND STORY is the first episode of NIGHTFALL: Intervention (Rhoen Border Security). If interested just watch them all. They are very short there isn’t an episode over 6 minutes. (Intervention, Human Element, Acquisition) :video_game: