Why am I not getting the armor?

So I completed the campaign on legendary and had just gotten all the acheivments. When I went to go check my new mark 6 armor I didn’t have It. I look at my commendations and sure enough there was the problem. It didn’t say I beat the last four missions, yet I shows on my acheivment records that I had it all completed and on legendary. I ask you 343 give me what I deserve. -Tj GT: Intervention Tj