The player in your room is not a sync license
Twitch, YouTube, and TikTok each have music rules, libraries, and detection. A muted VOD, a claim, or a blocked video is the usual result of guessing. Stream-safe playlists and the app’s own audio library are the boring path that keeps the VOD up.
A license for a YouTube video may not cover a livestream or an ad. Read the grant. "Royalty free" still has terms. If a sponsor requires a specific track, make them provide the license in writing.