You are correct and that is where I went.
Once I change the email, a message with a green background indicates,
We’ve sent an email to your current address. Please follow the confirmation instructions.
However, I never get it.
So I click on Emails and Skipped which states the “To Address” is “no_email” and the “Skip Reason” is,
501 5.5.4 Invalid TO: Missing domain
So the email was sent to “no_email” which means, you cannot change that defaulted address. However, it seems like there must be a way to do this.