Automating MSIX installation with PowerShell

[rdagher]

Hi,

Not really related to our hero, but I am pretty sure someone came across this issue when automating the installation of MSIX packages under windows (using powershell commands).

Assume we have generated a MSIX package and want to automate its installation (and update) using a powershell script called by a system service: example a puppet agent running as a window service.

Typically, the recipe for install woud use the Add-AppxPackage cmdlet inside a powershell script.

Assuming we're trying to install an unsigned package <MSIX_PACKAGE_NAME>.msix under Windows 11:

add-appxpackage -allowunsigned <MSIX_PACKAGE_NAME>.msix

Here is a log of the script execution

Windows PowerShell transcript start
Start time: ******
Username: WORKGROUP\SYSTEM
RunAs User: WORKGROUP\SYSTEM

[--snip--]

add-appxpackage : Deployment failed with HRESULT: 0x80073CF9, Install failed. Please contact your software vendor.
(Exception from HRESULT: 0x80073CF9)
Deployment Add operation rejected on package <MSIX_PACKAGE_NAME>.msix install
request because the Local System account is not allowed to perform this operation.

I understand it's a security policy for the SYSTEM account and not sure yet how this can be solved, but It would be great if someone can share his experience for achieving such task.