MDT powershell task fails, but returns return code 0

Question

Hi all,
MDT 8456 with 2004 patch, running a task sequence with a powershell script - even if that script fails, a return code of "0" is still returned to the TS.

If the script fails, i need the TS to fail..

From the logs

<![LOG[File \server\MDT4\Scripts\Custom\DeviceCompat\CheckCompat.ps1 cannot be loaded.
The file \server\MDT4\Scripts\Custom\DeviceCompat\CheckCompat.ps1 is not digitally signed. You cannot run this script on the current system. For more information about running scripts and setting execution policy, see about_Execution_Policies at http://go.microsoft.com/fwlink/?LinkID=135170.\]LOG\]!>\<time="18:38:58.000+000" date="11-03-2020" component="TaskSequencePSHost" context="" type="3" thread="" file="TaskSequencePSHost">
<![LOG[At line:1 char:3

• . "\server\MDT4\Scripts\Custom\DeviceCompat\CheckCompat.ps1
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~]LOG]!><time="18:38:58.000+000" date="11-03-2020" component="TaskSequencePSHost" context="" type="3" thread="" file="TaskSequencePSHost">
  <![LOG[SecurityError: (:) [], PSSecurityException]LOG]!><time="18:38:58.000+000" date="11-03-2020" component="TaskSequencePSHost" context="" type="3" thread="" file="TaskSequencePSHost">
  <![LOG[TSHOST: Script completed with return code 0]LOG]!><time="18:38:58.000+000" date="11-03-2020" component="TaskSequencePSHost" context="" type="1" thread="" file="TaskSequencePSHost">

Im a bit baffled as to why this is returning an error code of 0 when it cannot run due to signing restrictions!

Continue on error is not selected for this step.

Answer 1

The only immediate thing that comes to mind is, first, you're running this from the desktop I assume...

Also, do you have an execute restriction entry in your PS? Such as,
set-executionpolicy unrestricted -force

Also, in your Task, where the PS is, click on Options tab and make sure Continue on Error is not checked.