Windows could not parse or process the unattend answer file

I have been implementing Windows 10 enterprise solution to one of my client and bumped with below error over and over.
Windows could not parse or process the unattend answer file for pass [Speicalize]. The settings specified in the answer file cannot be applied. The error was detected while processing settings for component [Microsoft-Windows-Shell-Setup].

I have faced similar error in the past and successfully resolved by reviewing the computer name requirements for windows (mostly you will get similar error when you use invalid characters or long names in the computer name).
However this time the computer name is used as per the windows requirements but still having issues.

Eventually I went back to the task sequence and reviewed Apply Windows Settings step in the task sequence editor.
I have copied this task sequence from an existing task sequence. Previously I have used the same task sequence to deploy Windows 10 Preview and there is a product key entered in Apply Windows Settings step. I have removed the product key and tested. This time it worked without any issues.

The reason for the error is, The product key which was entered in the task sequence  is not applicable to the current version of the windows so the windows mini setup giving Windows could not parse or process the unattend answer file for pass [Speicalize] error.