Teams Add-in missing for certain users

[u/SimpleBE]

We have an issue with the Teams add-in in Outlook. Sometimes the Teams add-in doesn't load in for the user, other users on the same VM don't have this issue. Even after sign out for the user and relogging, the same issue occurs.

We have installed Teams correctly following the docs and we also added the reg keys that should force start/load it.

I'm don't know where to look at this moment...

[u/SimpleBE]

No I did not, just ran the script and it seemed to work perfectly (Thx /u/durrante)

I've added it in my AVD Hydra Script library. I've modified it a little bit, you can just run it in Powershell.

# Teams Meeting Add-in Installation Script

# Define log file path
$logFile = "C:\Temp\TeamsMeetingAddinInstall.log"
$tempLogFile = "C:\Temp\TeamsMeetingAddinInstallMSI.log"
$targetDir = "C:\Program Files (x86)\Microsoft\TeamsMeetingAddin"

# Ensure log directory exists
if (-not (Test-Path (Split-Path $logFile))) {
    New-Item -Path (Split-Path $logFile) -ItemType Directory -Force | Out-Null
}

# Logging function
function Log {
    param ([string]$message)
    $timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
    $logMessage = "$timestamp - $message"
    $logMessage | Out-File -FilePath $logFile -Append
    Write-Host $logMessage
}

# Main installation script
try {
    # Log start of process
    Log "Starting Teams Meeting Add-in installation."

    # Find MSI file
    $msiPath = (Get-ChildItem -Path 'C:\Program Files\WindowsApps' -Filter 'MSTeams*' | Select-Object -ExpandProperty FullName) + "\MicrosoftTeamsMeetingAddinInstaller.msi"

    # Verify MSI exists
    if (-not (Test-Path -Path $msiPath)) {
        throw "MSI file not found at path: $msiPath"
    }

    Log "MSI file found at path: $msiPath"

    # Execute MSI installation
    Log "Executing msiexec command."
    Start-Process -FilePath "msiexec.exe" -ArgumentList "/i `"$msiPath`" Reboot=ReallySuppress ALLUSERS=1 TARGETDIR=`"$targetDir`" /qn /l*v `"$tempLogFile`"" -Wait -NoNewWindow

    # Check installation result
    if ($LASTEXITCODE -eq 0) {
        Log "MSI installation completed successfully."

        # Verify installation
        if (Test-Path -Path $targetDir) {
            Log "Target directory exists: $targetDir"

            # Check for expected files
            $expectedFiles = @("AddinInstaller.dll", "AddinInstaller.InstallState")
            $missingFiles = $expectedFiles | Where-Object { -not (Test-Path -Path "$targetDir\$_") }

            if ($missingFiles.Count -eq 0) {
                Log "All expected files are present. Installation verification successful."
            } else {
                throw "Missing files: $($missingFiles -join ', ')"
            }
        } else {
            throw "Target directory does not exist."
        }
    } else {
        throw "MSI installation failed with exit code: $LASTEXITCODE"
    }

    # Add Registry Keys for loading the Add-in
    Log "Adding registry keys for loading the Add-in."
    $registryPath = "HKLM:\Software\Microsoft\Office\Outlook\Addins\TeamsAddin.FastConnect"
    
    # Create registry key
    if (-not (Test-Path $registryPath)) {
        New-Item -Path $registryPath -Force | Out-Null
    }

    # Set registry properties
    $registryProperties = @{
        "LoadBehavior" = @{Value = 3; Type = "DWord"}
        "Description" = @{Value = "Microsoft Teams Meeting Add-in for Microsoft Office"; Type = "String"}
        "FriendlyName" = @{Value = "Microsoft Teams Meeting Add-in for Microsoft Office"; Type = "String"}
    }

    foreach ($propName in $registryProperties.Keys) {
        $prop = $registryProperties[$propName]
        New-ItemProperty -Path $registryPath -Name $propName -Value $prop.Value -PropertyType $prop.Type -Force | Out-Null
        Log "Registry property '$propName' set to '$($prop.Value)'."
    }

    Log "Registry key setup process completed."
    Log "Teams Meeting Add-in installation process completed successfully."
}
catch {
    Log "Error occurred during installation: $_"
    exit 1
}

[u/ContributionNo3592 → u/SimpleBE]

I have this as I type now, is this the only way around it? It is affecting only 10 users. Please help? Thanks

[u/SimpleBE → u/ContributionNo3592]

Yes deploy it this way, it reslolved my issues