@MojangSupport my friend purchased Minecraft a while ago and now it says he does not own it.
When only the demo mode is accessible or it's asking you to pay again, this means that you're logging in with an account that doesn't contain a Minecraft profile/username or a copy of the game. please visit https://help.minecraft.net/hc/en-us/articles/360029643892-Can-only-play-Minecraft-demo-Java-Edition- … for possible solutions. Thanks! ^AS