@stuu3270 I know that this will sound like a cliche, but try changing the password for the secondary account concerned. It has worked for others posting with similar issues.
Sign in to My Virgin Media, go to My Profile and/or Manage Accounts depending on whether the account concerned is your primary account or an additional one. Select the account concerned and then click on Change to the right of password if a primary account or View/Change then change to the right of password for secondary accounts.
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I'm sorry to hear you've been struggling to access one of the secondary email accounts you have with us, I'll be more than happy to help look into this for you. I'll pop you over a PM now so I can take some details and clear security 🙂
Thanks for chatting with me over PM, glad to hear you're now able to access your mailbox.
In answer to your question about what caused the account to be locked out: this happens as a security measure when the account is flagged for spam activity - but can also be triggered by legitimate activity from time to time.
If you have any concerns, we would advise to reset the mailbox password to ensure that the account is secure. To go the extra step, you can also reset your security questions and answers on the account.