By default, MSIX packages must be digitally signed. If you are installing a dev build or an internal app without a trusted certificate, the installation will fail.
Add-AppxPackage -Path "C:\app.msix" -LicensePath "C:\license.xml" powershell install msix
Add-AppxPackage -Path "C:\app.msix" -ForceApplicationShutdown -AllowUnsigned By default, MSIX packages must be digitally signed
Tip: Use Get-AppPackage first to find the exact PackageFullName . powershell install msix
: To install a package that hasn't been signed, add the -AllowUnsigned flag (requires Admin privileges for executable content). All Users (Provisioning)
PowerShell Install MSIX: The Ultimate Guide to Deploying Modern Apps