Nightfall armor

I saw the five chapters of halo nightfall more than 5 times and did not give me the armor

I have the master chief collection and installed halo channel and halo nightfall , so my problem is that I can’t watch halo nightfall. What happens is I go to halo channel and go to halo nightfall to watch the series and it says I have to buy it when I already have it installed , can I just please watch my series, I really want to watch it

Same

how do i get my money back for Nightfall…it doesnt work at all!!