@TeamYouTube My old youtube account has been hacked - I can't remember the email address used to register but I can prove I am the rightful owner as it it named after myself and have multiple videos on my main account from the same timeframe in the same room as the ones uploaded.
Just to confirm, have you tried signing in following the steps outlined here: https://yt.be/help/nr5L ? You'll need to know your phone number or the *recovery* email address for the account. Keep us posted!