If I understand the documentation right, "middleName" is an LDAP property that is obtained by calling the User object METHOD "OtherName" - so you may have to do: 
   $property = $connect->get_property('OtherName');

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*Untested*

        ...it is unhealthy to remain near things that are in the process of blowing up.     man page for WARP, by Larry Wall

In reply to Re: problem with getting Active Directory user properties with library Win32::AD::User by NetWallah
in thread problem with getting Active Directory user properties with library Win32::AD::User by pokoini4ek

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