[WEB-2015] Windows 10 Edition Gift Code cannot be redeemed again

Note

Mojang have acknowledged this and are working on a fix: https://twitter.com/jenp24211667/status/1245434610214821893

When trying to redeem my free copy of Minecraft: Windows 10 Edition, I get the following error:

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!