I am switching to new SATA harddrive and have to reinstall Windows 10, but I can't figure out how to activate it.
I am at the Update & Security and clicked on Activation and the Activate button. It keeps telling me that

"Windowss can't activate. Try again later"

I read that if you switch hardware like a harddrive, this happens. I followed instruction online to find the Add a Microsoft account but that button does not appears in the Update & Security page. I am logged in as admin.

Any help is greatly appreciated.