Open the YouTube Help webpage at support.google.com/youtube.
Log into your Google Account, if you have not already done so.
Open the Help Centre menu and scroll down to either "Fix a problem" or "Manage your account and settings."
Eligible accounts will find a new option, "Recover a hacked YouTube channel."
This new page includes a "Chat with our hacked channel assistant" button, which opens a chat window for the AI assistant.