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Hi, I had the same issue and finally figured out how to resolve. When in VM Fusion, at the top, go to Virtual Machine pulldown menu, then Settings, then Keyboard and Mouse, then click the settings icon (under the windows version you are using) - edit profile. Then add a new keyboard mapping. I found the one that works for me is to input Option on the Mac side and Control on the Virtual Machine. See screenshot for more info.
Hope that works for others!