ok, reading your post and checking your names, it seems that it only cares about the name, not the sharename.
lol, it actually says that in the definition of the udf "printers name"
not clear, but it is there ;\)

so, check against:
\\server\printername

you guys might also want to check:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\PrinterPorts

that might list the actual sharename, not sure.
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