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.
You need to be connected to the Internet in order to activate Windows. If you are reading this on a different device, ensure the device you are activating is connected to the internet. For more, see Get online.
The following are some problems that the troubleshooter may fix: