Are you a current VM broadband customer?
Is the address showing when you log in to my virgin media billing area? (A primary address would be on the my profile page/scroll down to my services, or on the manage accounts tab for secondary addresses)
Is the address showing as valid if you run it through mailtester.com?
You can reset the password following the advice here: https://www.virginmedia.com/help/virgin-media-reset-username-and-password
The answers to these questions will help us to guide you. Let us know how you get on.
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