"This code has already been redeemed." MC Win 10 Beta key

I just bought a $10 gift card and i went to redeem it but it said the key has already been redeemed

Translation:

Activation key

Good afternoon!

Please tell me how to find out if a key is activated for a subscription?

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Answer:

Hi, you can simply try to redeem it in the store, if the code is valid the store will tell you what are you redeeming and ask if you want to continue; if the code has been already redeemed the store will tell you that the code has been already used and is
not valid

Where did you buy the Game Key from? I wonder if it has already been redeemed or maybe is a fake code

I redeemed the code probably within 15 minutes of when it was posted. I can't explain why your keys didn't show up if the message you are getting says that code has already been redeemed. Weird... Did you check to see if your key quantity went up?

If you did not get an xbox redeem code in the product key section you have already missed out on the BETA. They gave the key automatically in that section to the people who will be testing the beta anyone who requests a key as per the instructions because
they do not see one listed will get second choice meaning you might have access at a later date but probably wont be beta testing anything because xbox gave the codes automatically to those people it wanted as testers.