Welcome! If you're a beginner, you might want to take a look over here:
https://groups.google.com/g/video-downloadhelper-q-and-a/c/zW_fNhqqYVs
Also, I would normally recommend you report your problem according to these ideas:
https://groups.google.com/g/video-downloadhelper-q-and-a/c/_DmryjDe_Ck
But I suspect you're going to say these meetings are confidential, they require the use
of a user ID & password that you must not share, & you can't give out the URL of one of
these meetings for anybody else to test with. In general, there is no international
standard for the way web sites present video content. It's actually a wonder to me that
Michel has managed to get VDH to work on as many sites as it does. But I suspect rather
a lot of web sites do things intended to prevent downloaders from working. In most cases
on a site where VDH detects a large & ever increasing number of small variants, the
company line is that the web site is not presenting sufficient information for VDH to
figure out how to aggregate the pieces into a unified whole. And I'm not part of the
company. I'm just repeating what Jerome & Michel have said here numerous times. Jerome
is part of the company & Michel is the guy who designed & develops VDH. If by some
miracle it is possible to post a URL for one of these meetings & anybody can access it
without a user ID & password, that would be helpful. Do not offer to let somebody use an
ID & password. I know I will refuse such an offer because I don't want to be the one who
could be identified later as a potential security vulnerability. The company guys have
posted that it is against their policy to do so. Sadly, you're probably out of luck.