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Unable to activate Windows 10 w/ Windows 8.1 key
Hello everyone. So after remembering that I've read this would be possible at some point, I did some research and found that it's indeed possible to activate Win 10 w/ key from 8.1 after latest big update. I wanted to re-format the SSD and start from scratch. I bought PC w/ Windows 8.1 pre-installed and eventually upgraded to Windows 10. I had it up-to-date and I was logging in with email.
However, now when I've installed Windows 10 and updated it w/ 1511, I still can't activate my copy of Windows. This is the error I get: https://i.imgur.com/PmzIwDj.png
Does anyone have any idea how to activate Windows 10? Should I call someone at Microsoft? It's a business PC, so I can't have Windows that aren't activated or with illegal key, so I need to have this resolved within a few days tops. Any help would be very much appreciated!