The TV Anywhere platform falls over completely whenever demand is high, and that's usually when there's a big game on BT Sport.
I have been reporting this for 19 months now. Virgin Media keep insisting they have fixed it, and bury their heads in the sand every time someone points out that they haven't fixed it at all.
They will respond to this post, probably in about 5 days if you're lucky, asking if it's working again. Of course it will be, unless they ask while another big match is on. But the web team run away from the forums at any sign of such trouble, so that's unlikely.
The "best" advice I have been given on this matter is to not even try using TV Anywhere when the big matches are on. They are clearly missing the point entirely.
In short, don't hold your breath for a fix on this. In the 19 months this has been going on, the situation has become worse, not better.
Not working for us either. Keeps saying high demand try later. Great! This always happens when we need it most. Must be because there is lots of sport on the telly today. When will this be fixed? Does VM need to invest more? Certainly should have the funds since you put up the prices VM. Come on, deliver what you say you do.