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I think Autodesk's stance is that it is not supported. However, it does work. The issue you may find is that your VM may randomly change MAC addresses on you and invalidate your LIC file. My recommendation for you if you decide to virtualize your NLM is to hard code the MAC address into the virtual NIC to prevent this from changing. Other than this, it should work just as it would on any other server.
Good Luck!