The Active Directory - Basic authentication method was removed after OnBase 18. Client logins attempting to use this method will fail in OnBase versions after 18. To continue using Active Directory to authenticate users, you must change the configuration to Active Directory - Enhanced. The Auto-Configure Using Matching Group Names option is intended to assist in the migration from an existing Active Directory - Basic authentication method to the Active Directory - Enhanced method.
For more information on Active Directory authentication methods, see the Legacy Authentication Methods module reference guide.