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#1
Try opening a command prompt as admin and running:
then reboot.Code:slmgr.vbs /ato
Did you do an upgrade from Windows 7/8? Was your system activated and genuine before the upgrade?
Install a released version of Windows instead of staying on an old Insider Preview edition.
See the link posted here: Solved Help me, activation has a problem - Page 3 - Windows 10 Forums