Executing PowerShell scripts (PS1) during MDT UDI Task Sequence (install applications)

Hi all,

I'm trying to install applications in my MDT UDI Task Sequence.
All works fine except for PS1 scripts.

I have an install.cmd that contains:
powershell.exe -NoProfile -ExecutionPolicy Bypass -Command ".\install.ps1" -Verb RunAs
exit /b %errorlevel%

This is the error output from my BDD.log:
In-line script returned error output: File C:\WINDOWS\CCM\SystemTemp\1107fc26-b43f-4a87-8de6-b0e0483da4a3.ps1 cannot be loaded. The file C:\WINDOWS\CCM\SystemTemp\1107fc26-b43f-4a87-8de6-b0e0483da
4a3.ps1 is not digitally signed. The script will not execute on the system.

Seems like the -ExecutionPolicy Bypass isn't working, altough this script works when I run the install.cmd after OS is deployed, just not from my MDT UDI Task Sequence.

Could it be I need to add additional components to my boot images for PowerShell support?

EDIT:
I added these additional components but still no difference.

cheers,

Harm