You have a digital license for your device instead of a product key. This means you can reinstall the same edition of Windows that your device has a digital license for without entering a product key, if it's on that same device. There's no product key for you to write down, and you can't use it on a different device.
During reinstallation, if you’re asked to enter a product key, select Skip. In most cases, if Windows 10 was activated on your device before you reinstall, it will automatically activate after you go online.
