My USB is connecting and disconnecting and it is seeing it as a Mavic Air, but there is no way to register and the parameter settings and such are grayed out.
I had the same issue - Windows 7 would not recognize the Mavic 2 pro at all - in System / devices there were two driver errors (yellow exclamation points). I solved the problem by installing and starting DJI assistant. That installed the drivers. I immediately quit DJI assistant and proceeded with NLD process. Note that there are multiple versions of DJI Assistant - make sure you download the correct one for the aircraft you have.