I'm running LD 9.6 SP3
There was a article about replacing the Dism folder and the Dism.exe inside the Boot_x64.wim to fix the Hii Failure. I tried this and I still get failure. I put a pause in my template and looked at the Dism log and noticed it is trying to call up files in the X:\windows\system32\dism folder that are not there, however after looking in the old Dism folder in the boot_x64.wim I had replaced, it has the files that are being looked for.
What is the best way to fix the Hii failure when imaging a Windows 10 UEFI computer?