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And you will be given a Phone Number to ring Microsoft and they can manually activate your product that way.
This happens often because of Volume License keys that the Big Makers use and you need to manually activate the product because it has been activated too many times. and the MS Activation Servers need to be reset.
Of course if you have installed the product on several different computers and that is the reason you can not now activate it that’s a different story and you need to buy another Product Key from Microsoft.