My code says already redeemed when I try to redeem in for my own account. Can I get a new key?
I would reach out to Xbox Live Support on this one, they’ll be able to help out with issues relating to keys
Did that and they said to post a forum thread 
> 2533274809151757;3:
> Did that and they said to post a forum thread
Try on the website or the console, whichever you haven’t tried.
Barring that, PM me your code and I’ll take a quick look.