LDAP Authentication: Enable Login with Email Address

I  am attempting to enable user login using their username, email address or full username (with @domain.com on the end). I have configured the LDAP Authentication page as per below:

The test functionality works correctly however when the user goes to login it will only work with Appian user accounts that match what the user entered into the username field. What I am looking for is the ability for the user to enter username, email address or full username (with @domain.com on the end) and have that match to their Appian account based on the  sAMAccountName attribute in LDAP. Is this possible? Thanks!

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