Using VBA and WMI to read registry

I am leveraging WMI via VBA in Excel 2010 to read the registry and write it to a cell. The code works on similar items but I am having issues reading a WSUS value. The code works in a stand alone vb script but not in excel. Code:

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The value is returned as Null. I can manually read the value in the registry and it works through the VB script using wscript. Any help would be appreciated.