I received my Vi10 this past tuesday and I have the same key registration problem. I too bought it from Gearbest.
I got the Vi10 pro (64GB) version.
My key is X4W3R-YNK38-xxxxx-xxxxx-KHHTT
If I’m not mistaken, the Gearbest rep isn’t totally wrong. I did read somewhere that you had to set your time correctly for the region you’re in for Windows to activate properly, but I could be wrong! Anyway, I did set time correctly, but to no avail.
I contacted MS throught chat and they told me that my product key was indeed valid but it could be for another version of the OS. (currently 8.1 with Bing build 9600). They ended up telling me that I have to either have Gearbest send an activated tablet or contact Chuwi.
I’ll try and contact both gearbest and chuwi and see what happens.
