Redeemable Code for Minecraft Windows 10

I am trying to get my redeemable code for the Windows 10 version of minecraft (seeing as I bought the game well before 2018), but everytime I click the "get code' button, it comes up with an error stating;

"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!"

I searched various forums and people have said that this bug has been fixed, but every link I click on takes me round in circles and I end up with the same error. 

I understand this offer is ending in a few days, but I love this game and would love to redeem this code to continue playing it with my friends.

 

Thanks for your help