Cannot add app password for SMTP
VM seem to have recently changed something to require explicit logging into the SMTP server. The way to resolve this apparently is to generate one of these 4-word app-specific passwords to log into it with. Apparently I can do this within the VM WebMail portal at mail.virginmedia.com. My problem is, I can't get into this portal, I end up at https://www.virginmedia.com/help/virgin-media-mail-unavailable.
When I follow the instructions on that page, in Step 2 it says "Tap Manage next to Manage your Virgin Media Mail app password under Virgin Media Mail", but there is no such section on that page for me. Virgin Media Mail doesn't appear at all.
I suspect the root problem is that I've never used the mailbox that was originally set up when I moved to NTL World in the first place, I always had my own domain. I guess my VM mailbox has expired due to lack of use, or not migrated or something, and so now I can't get at any of the related sections of the site to create a password to use for SMTP.
Any suggestions on what I can do?