Am also receiving this message, but my broadband is working absolutely fine. It just seems to be the email part of the website again. Had the same issue a few weeks ago. Hopefully, will be sorted out soon as need to access my email to find a time for an appointment tomorrow morning. Also cannot access the Service Status part of the website either - getting Error 404 Page Not Found, which is ridiculous.
Like you all aspects of the Broadband are working fine except for issues with Emails. I still haven't been contacted by Virgin Media since my Windows Live Mail stopped receiving and sending emails after Friday 26th August 2022 giving an Error ID: 0x800CCC0F.