Hi. My Helioskrill armor and helmet are not unlocked for me. I beat the campaigns on Legendary during the Beta and just now noticed that my armor set is not unlocked for the full game. It was unlocked during the Beta only. I have the Legend achievement. Unless I am missing something obvious, I would like some help. Thanks.
A buddy of mine had this issue too. If you still have MCC, try playing a couple of campaign missions, then take a look back at H5.
Try going into the Halo Channel App, then going into Halo 5. Saw this solution a couple months ago and it worked for me.