If you were using the built-in local administrator account or domain administrator account to activate Windows, then use another account with administrator privileges to activate Windows. Run the SFC scan to rule out any corruption of operating system files. Once again make sure that you are entering the correct key. If the key has reached the maximum limit to activate Windows, then the user will face the problem under discussion. There is a fixed number of times you can use a Windows key to activate Windows. This is a very common scenario that was seen in a number of users. A corrupt/wrongly configured user account used by the user to activate Windows can cause this issue as well. 
A software glitch in the GUI of the system can hinder the activation process.
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