I confirm, When you set the option in ImageAssist to generate computer name automatically, Sysprep works fine, but when you set computer name with Service_tag, sysprep failed last update of ImageAssist and Windows 10 creator update (1703) 
Hello,  I am having trouble with Dell Image Assist (DIA) since Microsoft pushed the "Creators" update.  I am creating the image and right at the end, it fails.  We use the service tag as part of our company naming scheme and when looking at the unattend.XML file I see an underscore when it is referencing  CF10-Service_Tag  (text and error logs will be cleaned and added below). I think it is the underscore it has an issue with and that is being added by DIA.  Is there a fix for this? UNATTEND.XML     schemas.microsoft.com/.../State" xmlns:xsi=" www.w3.org/.../XMLSchema-instance">  CF10-Service_Tag  Company Name  Eastern Standard Time   schemas.microsoft.com/.../State" xmlns:xsi=" www.w3.org/.../XMLSchema-instance">    Domain.local  Password  User   Domain.local    schemas.microsoft.com/.../State" xmlns:xsi=" www.w3.org/.../XMLSchema-instance">  0   schemas.microsoft.com/.../State" xmlns:xsi=" www.w3.org/.../XMLSchema-instance">    NOTIFY_NODIM_UAC_EnableLUA 

   cmd /c reg ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 1 /f 
   1    NOTIFY_NODIM_UAC_ConsentPromptBehaviorAdmin 

   cmd /c reg ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v ConsentPromptBehaviorAdmin /t REG_DWORD /d 5 /f 
   2    NOTIFY_NODIM_UAC_PromptOnSecureDesktop 

   cmd /c reg ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v PromptOnSecureDesktop /t REG_DWORD /d 0 /f 
   3    CMDLINES4 

   CMD.EXE /C reg.exe Add "HKCU\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers" /v "C:\OEM Key Injector.exe" /d "~RUNASADMIN" 
   4       schemas.microsoft.com/.../State" xmlns:xsi=" www.w3.org/.../XMLSchema-instance">  false  false     schemas.microsoft.com/.../State" xmlns:xsi=" www.w3.org/.../XMLSchema-instance">  0409:00000409  en-US  en-US  en-US  en-US   schemas.microsoft.com/.../State" xmlns:xsi=" www.w3.org/.../XMLSchema-instance">     
Windows 10 "Creators" v1703, sysprep ERROR unattend.xml "computer name" invalid