Hello JoeGordon16,
Thanks for taking the time to post on the forums in regards to setting up an online account. We appreciate the confusion this is causing and welcome to the community!
Have you previously had an account with us and the app set up? Does it give you a specific error message or just that the account number is wrong?
If this is a new account it will have a new account number which can be found on the contract received, if there is already an account linked to the email address this might be the reason for the error messages. Have you tried deleting the old information from the app?
Rob