Problems with Windows Activation
Problems with Windows Activation
Reach out to Microsoft for assistance. The system might assume you're using a fresh device. Following the advice from @themctipers, connecting your Microsoft account should resolve the issue, since the login key is associated with it.
If the code is 8, try these steps: Hold the “Windows” and “R” buttons to launch the Run window. Type “SLUI 4” in the window and press Enter. You’ll see a “Phone Activation” screen. Select your registration country, then dial the activation number. After dialing, enter your installation ID on your phone. It will prompt you to confirm how many Windows copies are installed under this license—select “1”. Choosing other options won’t work. Once done, you’ll receive a confirmation ID and can proceed with a valid product key.