Hello
Thank you for posting in our Q&A forum.
First of all which activation key are you using when burning the image? KMS or MAK? If KMS, whether the client has a Microsoft Generic Volume License Key (GVLK) installed.
https://learn.microsoft.com/en-us/windows-server/get-started/kms-client-activation-keys
Second in the test environment is to use the command slmgr /rearm to reset the license status and activation status of the computer and use the command slmgr /ato to force activation.
https://learn.microsoft.com/en-us/windows-server/get-started/activation-slmgr-vbs-options
Regarding whether a different type of license is required, it is recommended to contact the Microsoft Volume Licensing Service Center to confirm:
https://www.microsoft.com/licensing/servicecenter/default.aspx
Best Regards,
Wesley Li