HI,
It's easier than ever to move from Windows 11 Pro to Windows 11 Enterprise—no keys and no reboots required. After one of your users enters the Azure AD credentials associated with a Windows 11 Enterprise E3 license, the operating system changes from Windows 11 Pro to Windows 11 Enterprise and all corresponding Enterprise features are unlocked. When the subscription license Enterprise devices are seamlessly downgraded to Windows 11 Pro when the license expires or is transferred to another user.
For related requirements and specific steps, please refer to the following document:
https://learn.microsoft.com/en-us/windows/deployment/windows-10-subscription-activation