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#80
Opening your autounattend.xml file in Notepad, I instantly noticed it is my sample answer file from step 3.22 which you have used without any modifications. Because of this, answer file being made by me I wouldn't even need to test it; I know it is correct and works.
Anyway, just to be 100% sure I just tested it on GPT / UEFI machine. In fact, I tested it twice, first with secure boot enabled, then with secure boot disabled. Worked like a charm both times.
I am sorry but as the answer file does not contain any errors and is working exactly as it should, I do not know what to suggest to you.
Not necessary your case, but the only scenario this answer would not work is if it was used on MBR disk on a BIOS based machine. The answer file is for GPT disk on UEFI machine, therefore using it on MBR / BIOS system would give this error:
Kari