Could not find HW Key on 8.81 PL5

Hello Expert,

I am using 8.81 PL5,I have used COM Licence Bridge 2.0 for 8.81 in my Add-on.

When I try to run Add-on from Server it works Fine for Following Code but it throws Exception for Client Machine.

Dim HKEY As String = ""

Dim LicInf As SBOLICENSELib.LicenseInfo = New SBOLICENSELib.LicenseInfo

LicInf.GetHardwareKey(HKEY)

Please help me out!!

Regards,

Bhavank