Out of Windows 10 Minecraft redeem codes?

I am trying to redeem a Minecraft windows 10 edition key from the Mojang website.

This is the prompt I am trying to redeem from:

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Minecraft for Windows 10

You bought Minecraft: Java Edition during a period of time when Minecraft for Windows 10 was included for free. Claim your redeemable gift code by clicking the button below and follow the instructions. As you
might have guessed, Minecraft for Windows 10 can only be played on Windows 10.

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It allows for users who have purchased the java edition of the game to then redeem a code for the windows 10 edition of the game.

This is the error message that pops up:

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Error! It looks like we've temporarily run out of gift codes for Minecraft for Windows 10. Don't worry though, more codes should be on their way. Please check back later!

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Thanks for any help!

I did that, and I redeemed the code on my alt. But it still didn't give me free Windows 10 Minecraft. Am I not doing it right?

If you redeemed the Code on your "alt", then Minecraft Windows 10 is bound to that account only.

In order to get Minecraft on your PC then, you would have to open the Store app on your Windows 10 device, and in the upper right, sign out of your "non-alt" account in the store app. Then sign in with your "alt" account, and you should find Windows 10 Minecraft
in your account's library. Simply download Minecraft from the library, and you should be able to play the game on your "non-alt" account as well.

But only your "alt" account that originally redeemed the code can re-download Minecraft from the store. No one else can.

I am not an expert, and I have the same problem. I first bought the "Minecraft: Java Edition", I wanted to use the redeem code to get "Minecraft for Windows 10", so I clicked "Redeem", I got the code, but when I entered it, it said "The code has already
been redeemed.", I checked my order history, it said that I had bought "Minecraft for Windows 10" using the code, but when I clicked install, it keeps showing me a small window with my code. I then checked whether if the account/email on Mojang, Minecraft.net,
and Microsoft Store, it was the same. So I don't get why I can't install "Minecraft for Window 10".

Actually it's a "Minecraft for Windows 10" and the redeem code is "F9C43-HD6HT-9KYKK-Y3DQJ-4WPFZ" but when I went to redeem it on the computer it displayed as already redeemed.

If you have Java Minecraft, sign in with your Mojang Account on the Minecraft Website, and you should get an offer to redeem a code for the Windows 10 Version.

However, it was long ago since I did that, and don't know where exactly you need to go.

After you got your code, you can go to the Windows Store App on your Windows 10 PC and redeem that code in the Store App to get Minecraft Windows 10 Edition.

EDIT: It seems that you need to have purchased the Java Edition before Oct. 19th 2018 to be eligible for getting Minecraft Windows 10 for free.

For more information check this website: https://help.mojang.com/customer/en/portal/articles/2064007-minecraft-for-windows-10