Where's my helioskrill?

Have the legend achievement on mcc, but do not have the helioskrill armor?

I’m having the same issue. I beat all the campaigns on legendary solo when the beta was out. I then was able to use the helioskrill armor in the beta. But when I loaded up halo 5 today it showed the armor as locked with three stars over it just like the other campaign Spartan amor such as Locke, vale, and Chief.