MSIX is a universal packaging format that combines the best features of MSI and AppX (the Windows Store format). It supports:
Solution: The signing certificate isn't trusted system-wide. Install the .cer file to Local Machine > Trusted People: install msix powershell all users
Import-Certificate -FilePath "C:\Path\To\Certificate.cer" -CertStoreLocation Cert:\LocalMachine\TrustedPeople
All-users installation requires elevated rights. You must run PowerShell as Administrator. Without elevation, the command will fail with an access denied error. MSIX is a universal packaging format that combines