Standard PowerShell commands like Add-AppxPackage only target the active user profile. To ensure an application is available to all current and future users, use the following methods. Method 1: Provisioning for All Users (Recommended)
To install an .msixbundle for all users via PowerShell, you must the package to the operating system. Standard installation commands like Add-AppPackage only apply to the current user. Primary Command for All Users install msixbundle powershell all users