The square application process did not validate email addresses. Furthermore, Square is not permitting the SBA to validate email address records with Square.
As such, the SBA is not able to validate which email address is valid. In this instance, the SBA can delete the Square application and allow you to submit a new application. This new application will be treated as a new application at the time of re-submission.
Please contact square if you have any questions regarding their email address verification policies.