you cant, nothing can be transferred from one account to another but from what I heard or read if it is less than 30 days you can call up support and cancel it and they will give you a token i think in a email (the one that is associated with your game tag/Live
account) and you can just apply it to the other account but do not quote me 100% on that, all I can say is try contacting support, good luck!
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