Hello,
Subscription activation for Education works the same as the Enterprise edition, but in order to use subscription activation for Education, you must have a device running Windows Pro Education and an active subscription plan with an Enterprise license. For more information, see the requirements section here:
A supported version of Windows Pro Education installed on the devices to be upgraded.
A device with a Windows Pro Education digital license. You can confirm this information in Settings > Update & Security > Activation.
The Education tenant must have an active subscription to Microsoft 365 with a Windows Enterprise license, or a Windows Enterprise or Education subscription.
Devices must be Azure AD-joined or hybrid Azure AD joined. Workgroup-joined or Azure AD registered devices aren't supported.
Important:
If Windows 10 Pro is converted to Windows 10 Pro Education by using benefits available in Store for Education, then the feature will not work. You will need to re-image the device using a Windows 10 Pro Education edition.
Additionally in case of a previous failed activation, it is recommended to use the command SLMGR.vbs /UPK to remove completely older activation information.
Reference: https://learn.microsoft.com/en-us/windows-server/get-started/activation-slmgr-vbs-options
I can recommend the next reference for Activation error codes that you can find in the System Event logs: https://learn.microsoft.com/en-us/windows-server/get-started/activation-error-codes
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