Hi wiltshire89,
Thank you for reaching out to us in our community and welcome, sorry to hear you are facing issues setting up an online account due to your Email address being used on your previous account.
When you move as the account number is set to the address and not the customer this will change, this means a new set-up is needed, as the Email address is already connected to the old account you will need to use a different Email address.
Once the new online account is set up you can go back in and change the username to your previous email you wish to use.
Regards
Paul.