@AmiePSO2 This hasn't worked for me. I got the card, redeemed it, and at checkout? It still requests a US address in order to proceed with the transaction.
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You can only purchase AC tickets within the United States. The error it's giving is basically saying that because you're attempting to purchase it from outside the United States, it can't process your payment. The only way I've found to deal with this is to directly contact Microsoft through their online customer support. They were able to process a single transaction for me.