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You could get some useful information here:
Deploy Windows 10 Enterprise licenses
From the official article:
Windows 10 Enterprise Subscription Activation (EA or MPSA) requires Windows 10 Pro, version 1703 or later.
Windows 10 Enterprise E3 in CSP requires Windows 10 Pro, version 1607 or later.
Automatic, non-KMS activation requires Windows 10, version 1803 or later, on a device with a firmware-embedded activation key.
Also, it is always recommended to consult a MS licensing specialist if you have any questions of licensing.
https://www.microsoft.com/en-sg/Licensing/existing-customer/activation-centers.aspx
Hope above information can help you.