Sorry, for my late reply. I’ve missed your message. It appears your router isn’t compatible with this integration.
The error is caused by the login function not being successful. It should return a token, which then can be used to retrieve the connected devices, but it actually returned a webpage. Which I can see from your logging. This is not a response I would expect based on the experiences I have with my own router. Which is an Arris router provided, as the Connect Box, by a Dutch cable operator.
Are you sure you have an Arris TG2492LG router? It appears the Virgin Media Hub can, just like the Connect Box, be one of multiple routers. Maybe the UPC Connect Box - Home Assistant integration works for you.
If you have the Arris router then it probably has an incompatible software version. Without having that same version running on my own router I’m not able to update the integration…