<#
.SYNOPSIS
    Launch the Teams install as the logged in user via a scheduled task
.DESCRIPTION
    This script will create a scheduled task if one is not found which is used to
    install Microsoft Teams as the logged in user. This scheduled task executes
    the Teams.exe found in %ProgramFiles% so that a user can start using Teams
    shortly after the Machine Wide installer completes instead of having to 
    log off and back on.
.NOTES
    Generally used as a script that runs after a Teams Machine Wide Installer completes
#>
if (!(Get-ScheduledTask -TaskName 'Teams User Install - Post Machine Wide Install' -ErrorAction SilentlyContinue)) {
    switch ([System.Environment]::Is64BitOperatingSystem) {
        $true {
            [string]$TeamsMachineInstaller = Get-ItemPropertyValue -Path registry::HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ -Name TeamsMachineInstaller -ErrorAction Stop
            [string]$Exe = $TeamsMachineInstaller.Substring(0, $TeamsMachineInstaller.IndexOf('.exe') + 4).Trim() -Replace "C:\\Program Files\\", "${env:ProgramFiles(x86)}\"
    
        }
        $false {
            [string]$TeamsMachineInstaller = Get-ItemPropertyValue -Path registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ -Name TeamsMachineInstaller -ErrorAction Stop
            [string]$Exe = $TeamsMachineInstaller.Substring(0, $TeamsMachineInstaller.IndexOf('.exe') + 4).Trim()
        }
    }
    [string]$InstallerArgs = $TeamsMachineInstaller.Substring($Exe.Length, $TeamsMachineInstaller.Length - $exe.Length).Trim()
    $newScheduledTaskSplat = @{
        Action      = New-ScheduledTaskAction -Execute $Exe -Argument $InstallerArgs
        Description = 'Start the Teams installer for the currently logged on user after a Teams Machine Wide install'
        Settings    = New-ScheduledTaskSettingsSet -Compatibility Vista -AllowStartIfOnBatteries -MultipleInstances IgnoreNew -ExecutionTimeLimit (New-TimeSpan -Hours 1)
        Trigger     = New-ScheduledTaskTrigger -At ($Start = (Get-Date).AddSeconds(5)) -Once
        Principal   = New-ScheduledTaskPrincipal -GroupId 'S-1-5-32-545' -RunLevel Limited
    }
    
    $ScheduledTask = New-ScheduledTask @newScheduledTaskSplat
    $ScheduledTask.Settings.DeleteExpiredTaskAfter = "PT0S"
    $ScheduledTask.Triggers[0].StartBoundary = $Start.ToString("yyyy-MM-dd'T'HH:mm:ss")
    $ScheduledTask.Triggers[0].EndBoundary = $Start.AddMinutes(10).ToString('s')
    
    Register-ScheduledTask -InputObject $ScheduledTask -TaskName 'Teams User Install - Post Machine Wide Install'
}

Select allOpen in new window

Clean up and redeployment procedure

1. Uninstall the Teams app installed for every user profile. For more information, see Uninstall Microsoft Teams.
2. Delete the directory recursively under %localappdata%\Microsoft\Teams\.
3. Delete the HKEY_CURRENT_USER\Software\Microsoft\Office\Teams\PreventInstallationFromMsi registry value.
4. Redeploy the MSI package to that particular computer.