If you have access to the mailbox of the [current owner email], reset the password for the current owner’s email following the Reset or change your Adobe password guide in the Creative Cloud User Guide.
Locate the password reset link sent to the current owner’s mailbox with instructions.
Set a new password, and change the email to [new owner email].
Navigate to the IMS Account to log in with the new email, and change the password.
After changing the email address and password, navigate to Magento.com to log in using the [new owner email].
However, if you don’t have access to emails sent to the [current owner email], follow these steps:
Set up email forwarding from the [current owner email] to a new email using your company’s mail server configuration.