Resolution:
There is an issue related to the AXIS jar that prevents COM's WebService Toolkit from recognizing dynamically generated WSDLs. This problem is specific to the COM interface and the Admin APIs, and does not affect other platforms or registered services.

To work around this problem:

   1. Generate the needed WSDL from the Manager&gtWeb Service List.
   2. Save the produced WSDL as an XML file.
   3. Edit the file and replace "soapenc:" references with "xsd:".
   4. Within the WebService Toolkit (ALT-F11 within Excel, and then Tools&gtWeb Service References), select Web Service URL and enter the fully-qualified path of the saved WSDL from the previous step.
   5. Click "Search". The available methods will appear in the "Search Results" Window.