indeed it seems that manual might have an error.
quote:

Parameters: Printer name
String that specifies the fully qualified name of the printer to set as the default printer. Note that if the printer involved was connected to using AddPrinterConnection, you must include both the servername and the sharename.

but indeed the error is not as you suggested.
your error was that you didn't read the manual.

if there is error, it's about sharename part.
afaik, it should be "\\servername\printername" or ruud has changed something later on that it works this way.
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