I signed up and got my internet up and running about a month ago but was unable to register for an account at the time. I tried again just now and still cannot, with the same error I was getting before. I am able to enter all the details but get the following message after setting the privacy settings.
We are not able to set up your my Virgin Media account at the moment. Please try again later, or you can also set up your my Virgin Media account at the time of your broadband installation. We are looking forward to connecting you to your superfast broadband.