Consider using UserPrincipalName when retrieving username from AD

[sethCOB]

Currently, the sAMAccountName field is utilized to pull the username of Persons, but longer username formats (such as firstname.lastname) are truncated due to the 20-character limitation for compatibility reasons.

This may cause confusion in mixed environments where the NT style is still utilized, or in environments where the UPN is what users have been trained to log on with.