Yesterday I waited over an hour, same thing this morning. What it does is this: When I click on Watch Live, for the first split second, the window pops up and then disappears. It’s like something is blocking it. I’ve allowed cookies, set My Privacy settings to allow it, etc. without success.
To the right of the two tabs on their page is a place to report viewing problems. I reported it. Perhaps if others who are experiencing the same problem report it as well, C-Span may check things out on their end...
Use the link I posted. It does the same thing initially but after a minute or two displays the lobby.....