After installing 3rd party product SecureAuth for 2 Factor Authentication logins are failing.
SecureAuth is configured by default to use the SAMAccount Active Directory attribute for logins. This is also the default for Authentication Services however this can be customized via the Control Center -> Preferences -> Customize Schema Attributes. If this has been set to something other than SAMAccount for logins SecureAuth will fail.
Set the SecureAuth login attribute to match Authentication Services.