"Video not available" is a fairly common (error) message. What it usually means is that the material is not legally viewable in the viewer's country and so the host site is blocking it. Almost every time I see the message the poster posted from a non-USA IP address and I attempt to view it from a USA IP address.
Those of a certain age will remember when DVD players and media had region codes. The typical consumer bought a DVD player for their region with their region code already set. The player would then refuse to play a DVD with a different region code. This allowed media outlets to release DVD content in different markets at different times and different prices and not lose sales to the earliest or cheapest release area.