Clear Chassis Intrusion Alert sample script does not appear to work.

New OptiPlex 790 workstations, running Windows 7 x64.  OMCI 8x64 installed using OM_APP_WIN_R300392.

I have downloaded a copy of the example script to clear chassis intrusion from here:

http://en.community.dell.com/techcenter/systems-management/w/wiki/omci-sample-scripts.aspx

We have not yet set a BIOS password so strAuthorizationToken = ""

Executing the script from an administrative command prompt using cscript results in the error "SWbemObjectEx: Invalid Parameter"

CScript points to the line Set returnValue = objInstance.ExecMethod_("SetBIOSAttributes", oInParams)

This is the exact script provided as an example on brand new hardware.  This should be the easiest thing in the world to test and it does not work.  If I am doing something wrong I would be grateful for the opportunity to admit and correct it but at this point I am unspeakably skeptical that this script would work if engineering actually tested it on a virgin install.

Any help would be greatly appreciated.