@Franck Marteaux
Hi,
Subscription Activation enabling users to “step-up” from Windows 10 Pro to Windows 10 Enterprise automatically if they are subscribed to Windows 10 Enterprise E3 or E5.
To take advantage of Windows 10 Enterprise E3, you must have the following:
-Windows 10 Pro, version 1607 (Windows 10 Anniversary Update) or later, installed and activated, on the devices to be upgraded
-Azure Active Directory (Azure AD) available for identity management
After one of your users enters the Azure AD credentials associated with a Windows 10 Enterprise E3 license, the operating system turns from Windows 10 Pro to Windows 10 Enterprise and all the appropriate Windows 10 Enterprise features are unlocked.
So the licenses related with Azure AD credential, Windows 10 Enterprise E3 is available as online services via subscription. Deploying Windows 10 Enterprise in your organization can now be accomplished with no keys and no reboots.
For your reference:
https://learn.microsoft.com/en-us/windows/deployment/windows-10-subscription-activation
Hope above information can help you.
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