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If the system came with Windows 10, then the digital key will already be installed on the motherboard and Windows should pick it up automatically. You will not be provided with any product key with your PC. So go into Settings (Windows icon > Gear Icon or Win+I) > Update & Security > Activation > Run Activation Troubleshooter. Check if this solves the problem. If not, go back to Settings > Update & Security > Windows Update and make sure Windows is up to date.