Legend achievement, but no helioskrill armor

I have received the achievement “legend” afew days ago in Halo: Master Chief Collection but didn’t receive the halo 5 armor variant that is suppose to be unlocked upon receiving the achievement. Is this a bug or something?

This is a bug sadly, I’m going throught it too, everywhere I’ve look it says and I have been told.

Hard reset your Xbox by holding off button for 10 seconds
Go to halo mcc customise your armour play a match or two wait twelve-ish hours
then load halo 5 and it should work