The best way to activate your windows 10 device without a product key is by using the digital license. Here is how you can use that on your machine.
1. You have to open the Microsoft official website and login with your account.
2. Now, you have to find the default page of Windows 10 from where you have to purchase the license for your product. Purchase the license from there and go back to your computer.
3. Now, you have to go to the activation tab on your settings and click on the sign in using a digital license link.
After you sign in with that email account, your windows 10 will be activated. You just don’t have to do anything out of the world to Activate Windows 10 pro without key.