Minecon 2016 Cape not redeeming

So I went to Minecon 2016, and afterwards, I received the email containing the redemption URL for the cape. However, upon clicking that URL and pressing the "Redeem Cape" button, I was greeted by an error reading "Something went wrong when trying to redeem your cape! The server encountered an unexpected condition which prevented it from fulfilling the request"

EDIT: Tried one of my cape codes this morning and it did work. However, now I have a new issue: since a parent went with me I was sent two codes, and I received two. But now, my other cape code, which I wanted to give to my brother, is telling me it's already been redeemed. Is there any way I can have another code sent to my email, since I don't remember redeeming two cape codes?