How do I get the email behind a tiktok account?

Basically I got harassed by a private tiktok account and i really want to know who it is because it might be someone i know. i’m basically just doing this to be petty though. anyways is there a way to find the email behind the account? i’ve tried saying forgot password to the username and some other things. how can i get into their account? find the phone number or email attached to the account?