@MojangSupport Hellow I have a problem. The problem is that I have bought a Minecraft accout for years and now I want to use it, but I can't because I only have the demo version but I bought it.
When only the demo mode is accessible, this means that you're logging in with an account that does not contain a Minecraft profile/username. If you haven't yet, please visit https://help.minecraft.net/hc/en-us/articles/360029643892-Can-only-play-Minecraft-demo-Java-Edition- … for a list of possible solutions. ^AF