When I try activating Win10 Pro, installed via OEI / OEM DVD, I get error 0xc004f050

Solution 1:

I dug this up after about half an hour of googling (quoting relevant bits below):

"Start button > left side, Settings > Update & Security > left side, click Activation > right side, click Change product key........

now enter the generic Win 10 Pro product key VK7JG-NPHTM-C97JM-9MPGT-3V66T > It will start switching your Home version to Pro version BUT it will NOT activate.

First, use the default Windows 10 Pro activation key...

VK7JG-NPHTM-C97JM-9MPGT-3V66T

Then you'll have a temporary Windows 10 Pro license. Now use your activation key off the package to get your permanent license.