Automatic, non-KMS activation requires Windows 10, version 1803 or later, on a device with a firmware-embedded activation key. Most OEM-provided devices designed to run Windows 8 or later will have a firmware-embedded key.
Check this Microsoft document for detailed information
https://learn.microsoft.com/en-us/windows/deployment/deploy-enterprise-licenses
This article give us a good demo
https://cloudaffinity.co.uk/2020/11/21/understanding-microsoft-subscription-activation-part-2/
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