Hello Tony,
Currently, your Business Rule updates only the User Logon Name (pre-Windows 2000) property (ldap name sAMAccountName). In addition to that, your Business Rule needs to also update the User Logon Name property (ldap name userPrincipalName). If you are having difficulties with adding this to your Business Rule, you can post here or email us to support[at]adaxes.com a screenshot of your current Business Rule so that we could provide you detailed instructions.