Minecraft Windows 10 edition free code on Mojang Account not working

Players who have purchased Minecraft: Java Edition before October 19th, 2018 can get Minecraft for Windows 10 for free by visiting their Mojang account. Once you've migrated your account, you will be able to claim a code for Minecraft for Windows 10

Players who already have the previous PC or Mac edition of Minecraft (running on Java) can
download Minecraft: Windows 10 Edition for free.

Note You'll need to get a code from Mojang, the game developer, by signing in to your Mojang account before attempting to redeem your code for Minecraft: Windows 10 Edition. Otherwise, you
may incur a charge. To get your code from Mojang:

1. Sign in with your Mojang account.
   
2. Under Minecraft: Windows 10 Edition, select the link to request a code. Microsoft Windows 10 will open.
   
   Note You'll need to sign in to or create a Microsoft account. If you sign in, use the Microsoft account you use to sign in to your Xbox account.
   
3. If you're running Windows 10, you'll be able to download the game right after redeeming your code. If you're running an earlier operating system, you'll need to come back to Microsoft Store once you're running Windows 10.
   

The code you receive from Mojang will be kept on your account, in case you’re unable to redeem it straight away, or in case you have problems trying to redeem it in Microsoft Store.

For more info:
https://support.xbox.com/en-US/games/game-titles/minecraft-windows-10-edition-faq

Hello,

Minecraft for Windows 10 included with the purchase of Minecraft: Java Edition?

Well Players who have purchased Minecraft: Java Edition before October 19th, 2018 can get Minecraft for Windows 10 for free by visiting their
Mojang account.

(sorry if not much help)

-ROBOTIC

Since you purchased the Java Edition before October 19th 2018, you might be eligible to get Minecraft windows 10 edition for free if you visit your Mojang account through Mojang Studios Account

Sign in and go to 'Games', and you shall find a button to claim the gift code!

This is taken from the mojang page here
https://help.mojang.com/customer/en/portal/articles/2064007-minecraft-for-windows-10

Is Minecraft for Windows 10 included with the purchase of Minecraft: Java Edition?

Players who have purchased Minecraft: Java Edition before October 19th, 2018 can get Minecraft for Windows 10 for free by visiting their Mojang account. Log into
account.mojang.com, and under the “My Games” heading you will find a button to claim your gift code. If you purchased Minecraft: Java Edition after October
19th, 2018, the button will not be there, so if you’re unsure of when you purchased Minecraft: Java Edition, that’s a good way to check. Pressing the button will generate a token and send you to a Microsoft redemption page.


If you have an older Minecraft account (you still log in with your username), visit
this article to find out about account migration. Once you’ve migrated your account, you will
be able to claim a code for Minecraft for Windows 10.
You must be signed into a Microsoft/Xbox Live account in order to redeem the code. Please note that you cannot move the license once the code has been redeemed. Your code is saved on your Mojang account page for future reference.