Hi dthorb75 👋 Welcome to the community forum! Thanks for posting.
Sorry to hear about these difficulties with an NTLworld password change. There could be a few different elements at play here so I will do my best to clear things up, and will then offer further support.
You need to have current active services with us to access any NTLworld, Blueyonder or virginmedia mail services. Each email inbox for one of these will be linked to a My Virgin Media account, which requires it's own unique login to access the mailbox, for secondary security authentication, and to generate any passwords needed to access the mailbox in a 3rd party application (such as outlook or applemail.)
You can find loads of general help information about managing your email account here 👉 https://www.virginmedia.com/help/broadband/manage-email-settings and managing My VM accounts here 👉 https://www.virginmedia.com/help/billing-and-payments/manage-my-account .
If you are trying to add the email address onto a device you need to use a special password generated through your My VM account for that email address. You do this by following the process outlined in the section titled 'How to set an app password to use an email app' from the 'manage email settings' help page linked just above 👆. To be clear - you need to use the app generated password and can't use the password you would use to access My VM for the email address.
I will send you a PM to confirm a few details and ensure you have your My VM accounts set up correctly, and access to the emails that you need. You can find this in your Inbox ✉ in the top right corner of the page. We can then return to this public thread to provide any further updates when possible. Thanks for your patience and co-operation in the meantime! 🌞