Obsidian Six Pack code redeemption, items not appearing in game

Like @wolfmanbush said, it can take up to 72 hours for cosmetics to be added into your account.

It could also be because all codes were turned off by rare. From what I heard, only partners can give rare your gamertag, then you’ll have the cosmetics added to your account. I don’t know much about this nor how it works. So there’s a chance rare hasn’t turned off the codes yet.

If you don’t get it in your account within 3 days, ask the streamer what to do, or raise a support ticket with rare.

You can make sure you redeemnd it on right account/it actually worked from... was it microsoft's billing history? There you can see all you have bought including redeempt codes.