Just redeemed ferryman dlc to the wrong account.

Logged into Xbox.com, picked redeem code. It moved me to the MS website. As I knew I was on the correct account on Xbox.com, I went ahead and typed the code in. The link it took me to was logged into another MS account, and it didn't think to notify me of this? So mad right now. So I have one account with the game, one account that isn't even used to play games that has the DLC. W*F. Can this be solved? What kind of stupid system is this? Wy wouldn't it notify me? It just opened it with a box to put the code in, of course I'm going to type it in if I went there straight from Xbox.com after logging into the correct account.