If you get "Video unavailable"; you must send a Referer header, this means not setting Referrer-Policy: no-referrer or another type of policy that would result in no Referer header for the YouTube domain.
If you get "Video unavailable"; you must send a Referer header, this means not setting Referrer-Policy: no-referrer or another type of policy that would result in no Referer header for the YouTube domain.