我不能使用兌換碼 來購買java Minecraft

This report is invalid, as it has been posted in a language other than English. Just to inform you, the bug tracker only handles issues reported in this particular way, as this is the most common language upon Mojang Studios so, if this isn't your main language, and/or you're not fluent in it, you may use an online translator to describe your issue. See the Bug Tracker Guidelines for more information.

Google translates the description of this report as:

I use the official website to download the java version, but I can’t use the redemption code to redeem the code to purchase

This is an account issue.