Hi @Eaven HUANG ,
Thanks for posting on the Q&A.
MDT build 8456 is the latest version available on the Microsoft Download Center, we do not need to operate it. Please remove the Windows ADK and the WinPE add-on for the Windows 10, and then download and install the WinPE add-on and the ADK for Windows 11 to have a try.
Here is the link about the ADK for Windows 11:
https://video2.skills-academy.com/en-us/windows-hardware/get-started/adk-install#download-the-adk-for-windows-11
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