“The requested document does not exist on this server.
Okay”
SAD.
It could easily be me, running Linux/Brave with other Desktop lockdowns.
Try just cutting and pasting the address: https://www.youtube.com/watch?app=desktop&v=yjn6wK01cqk
Or maybe this second effort at a link from my PC will work: https://www.youtube.com/watch?app=desktop&v=yjn6wK01cqk