@MojangSupport Hello my brother bought the java version of the game a few months ago and he can no longer connect and that puts him in demo mod in the launcher.
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