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.
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: