Authenticators make cracked accounts which is impossible to join multiplayer with. This person was probably trying to track your ip or install malware on your pc. If a cracked account joins a minecraft server it will just say “invalid name” and would not allow you to join. I think this guy was just trying to do not nice things. If you downloaded that they could have stolen your minecraft account or logged your keystrokes to steal all your passwords. Never download sketchy things off the internet.
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