Ok I did my best I can reading all the posts and I thank everyone for their efforts and input. I have a Surface Pro 3. I used the ESD made and ISO of x64 Pro and upgraded it. It says it is activated. I'm about to do the Clean Install. I'm just curious of why is the Clean Install Required? Does that connect my UID to a new Product Key in their DB?
The Fresh Install is optional, no need if you don't want. Since a lot here prefer to install a new OS from scratch, it was interesting to now that it works.
A normally bought 10 Retail key will still offer this. Question is how the Free Upgrade Licensing will be handled in this regard. Shouldn't be confused.
same happened in me after i upgrade my Windows 7 PRO SP1 OEM:COA i have upgrade it in this build it was already activated.. be honest i always i use e-mail.. but anyway its perfect i didn't make yet clean installation i can wait 8 days for make clean installation..so till then i have keep my keep and reserve in vmware.. so i'm full for now xD now i don't know if the keys of win 7 or 8.1 geniune help or not cauze alot people have activated from non geniune keys in permant activation.. so its totally mess and i don't know if microsoft want do it with that way except ofcorse is permantly and didn't timebomb (1 year)