When I contacted the support URL on this bulletin board, a reply arrived one month later and the code was sent by e-mail.
My email
"I purchased Minecraft: Java Edition while Minecraft for Windows 10 was included for free, but when I click the" Claim your free copy "button on the mojang account page, the following error is displayed and I cannot get the code.
`` 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! ''
We try every day, but no gift code will be issued. "
Reply
"Hello,
Thank you for your inquiry about the Minecraft account. I'm Scott from Minecraft Support.
I'm sorry to have had you wait a long time for this matter. Although you purchased the Minecraft Java version before October 18, 2018, an error stating that the gift code has expired occurred at the time of redemption. Thank you for confirming your registered
email address.
According to our research, your registered Mojang account is eligible for a free Minecraft Windows 10 (BE) redemption promotion, and we will provide you with a supplemental gift code. Minecraft Windows 10 version is linked to Microsoft account, so please
open the application of Microsoft Store, confirm that you have logged in to your registered Microsoft account, and use the following game code.
**** **** **** **** (code)
If there are any problems with the redemption of the gift code, we would appreciate your reply. Please do not hesitate to ask if you have any questions or concerns.
Thank you.
Best regards,
Scott”
It took time, but we were able to respond properly
Thank you support