You may have to contact support. They can redeem it manually, than it should update as the code has been redeemed to the selected account. I've had to do that before. You can also go online to Ambassadors program so they can assist you. https://ambassadors.xbox.com/
You may have to contact support. They can redeem it manually, than it should update as the code has been redeemed to the selected account. I've had to do that before. You can also go online to Ambassadors program so they can assist you. https://ambassadors.xbox.com/