@Jobworks 

As far as I know, we are only allowed to use one email address to manage one QBSE account. We can use the same email address to manage multiple QBO accounts. I would recommend opening a new QBO account with another email address, migrate the data from your QBSE account, cancel your QBSE account, then ask Support to change your email address of QBO account.

https://quickbooks.grsm.io/Canada