Not Receiving Xbox gift cards from myrewards app

They've changed the way you receive it now. Instead of entering a code, it's automatically applied to your account.

Again

I can't answer for Microsoft as I am not an employee.

However, I wouldn't think that Microsoft would feel disadvantaged. As, Everytime a user redeems a gift card Microsoft is receiving the proper payment for purchase of that gift card.

Even if the app you are using purchases the gift card from a third party seller, that third party seller would have a contract with Microsoft and would have purchased the gift card from Microsoft to begin with. This no matter how you look at it Microsoft is
making sales on these gift cards and receiving proper compensation for them.

I would think that the opposite of disadvantaged would be true, as these gift card redemptions increase Microsoft sales of the same giftcards

I would like to clarify, did you receive the game as a gift or did you receive an Xbox gift card from a friend that you used in buying the game?

The $10 gift card is a promotion from microsoftstore.com. You would have needed to preorder from them in order to receive the gift card.

The $10 gift card was an offer from microsoftstore.com. You would have to contact their customer support for assistance with that offer. If you are a Rewards member, and the preorder offer was running at that time ( I can't remember), you would have received
15,000 rewards credits instead of the $10 gift card. The credits would show on your Rewards statement on the MyRewards section of the site. If you don't see them listed there, you would need to post in the Xbox Rewards Questions support forum for assistance. Keep
in mind that in order to qualify, the game had to be preordered as a physical disc from microsoftstore.com. Digital orders from the Xbox store would not have been eligible for either offer.