Hi @Nicoco 👋
A warm welcome to our Community Forums and thanks for your post.
I am sorry to hear you're having some issues accessing your NTL email account.
As Graham mentioned, if the mailbox is not tied to an active broadband account, it may be the case it has been deleted. This usually happens after 90 days after the account closed but do slip through the net.
I'll pop you a PM now to confirm some details and then we can check the status of the mailbox.
Speak soon 😊