Won't Activate After Clean Install

Aug 9, 2015

I have been an Insider since the very first Insider build was released. I had installed each and every build first being on the Slow ring and the on the Fast. I had upgraded from a genuine Windows 8.1 Pro.

When the final RTM build TH1 Professional 10240 was released to Insiders ahead of schedule, I readily installed it and my machine was permanently activated at that time. The product key used was a generic one ending in 3V66T. Many of you may be knowing this.

Today, in fact just now, I formatted my system partition and installed a clean copy of Windows 10 Pro from USB which I had created using the Microsoft Creation Tool. When the setup asked me for a product key, I entered the same generic key as stated above. But now when I go to the Settings, it says the key doesn't work and hence, my machine cannot be activated. I signed-in using my Microsoft account before using the PC.

What the heck! I am an Insider. And didn't expect this to happen. What should I do next? Would the machine get activated itself after some time?

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