100% sure. I only have steam on this 1 machine (don't use mobile app). Didn't do anything different this time, to the previous times I have done it. Only difference is, I am now on Windows 10... whereas all my previous VPN unlocks were done on 7 and 8.1
I'm also on Win10. Strange.
So are people saying that GMG is doing the same as the grey market key sellers?
In some cases, yes.