Create Customer Statements Error: Identify incorrect email address in customer metadata

Summary:

Create Customer Statements ends with warning/error. The job log has no information to identify the error - it just shows rows and rows of the same message, as shown below. Because of the error, the statement run dates do not update and our customers keep receiving statements which show dated, cleared transactions - which they don't want, and we don't want to send them.

Our support partners have informed us this is because one of the emails to one of our customers has an incorrect email address. We have a report to use to try to identify which customer has an incorrect email address. But this is ridiculous. We have a report with 9,000+ entries, and have corrected the email addresses with obvious errors (invalid characters such as &). The problem persists.