If you're unable to activate Windows 10, the Activation troubleshooter could help. To use the troubleshooter, select the Start button, select Settings > Update & security > Activation , and then select Troubleshoot. You must be an administrator to use this option; for more information, see Create a local user or administrator account in Windows 10.
If you receive an error code and none of the steps below work, see Get help with Windows activation errors.
The following are some problems that the troubleshooter may fix: