diff --git a/.gitignore b/.gitignore
index ff5b00c..28428da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -261,4 +261,9 @@ paket-files/
 
 # Python Tools for Visual Studio (PTVS)
 __pycache__/
-*.pyc
\ No newline at end of file
+*.pyc
+
+
+# Project specific exclusions - ZIP files (so Teams apps aren't inadvertently included, and Temp folder).
+Temp/
+*.zip
diff --git a/Scripts/2.0/Add-ValidDomainToTeamsApp.ps1 b/Scripts/2.0/Add-ValidDomainToTeamsApp.ps1
new file mode 100644
index 0000000..60986e7
--- /dev/null
+++ b/Scripts/2.0/Add-ValidDomainToTeamsApp.ps1
@@ -0,0 +1,83 @@
+<#
+ .SYNOPSIS
+    Add-ValidDomainToTeamsApp.ps1
+
+ .DESCRIPTION
+    Adds a valid domain to a custom Microsoft Teams app manifest file
+
+ .PARAMETER AppManifestPath
+    Path to the app manifest file to add the valid domain to
+
+ .PARAMETER ValidDomain
+    The domain to add as a ValidDomain to the Microsoft Teams app manifest file
+
+ .PARAMETER NoBackup
+    (switch) Don't take a backup of the app manifest file
+
+ .PARAMETER KeepTempFolder
+    (switch) Keep the temp folder where the script updates the manifest
+
+#>
+
+param(    
+    [Parameter(Mandatory = $false)]
+    [string]$AppManifestPath = ".\Valo.Connect.app.zip",
+
+    [Parameter(Mandatory = $true)]
+    [string]$ValidDomain,
+
+    [Parameter(Mandatory = $false)]
+    [switch]$NoBackup,
+
+    [Parameter(Mandatory = $false)]
+    [switch]$KeepTempFolder
+
+)
+
+if ($true -ne $AppManifestPath.ToLower().EndsWith(".zip")) {
+    Write-Error "AppManifestPath doesn't have a .zip extension"
+    exit
+}
+
+$AppManifestFile = Get-Item $AppManifestPath -ErrorAction SilentlyContinue
+
+if ($null -eq $AppManifestFile) {
+    Write-Error "Couldn't find file from AppManifestPath paramater: $AppManifestPath"
+    exit
+}
+
+$DestinationFolderName = $AppManifestFile.Name.Replace($AppManifestFile.Extension, "")
+$DestinationPath = Join-Path -Path $AppManifestFile.Directory.FullName -ChildPath "Temp" -AdditionalChildPath $DestinationFolderName
+
+Expand-Archive $AppManifestFile.FullName -DestinationPath $DestinationPath -Force
+
+$ManifestPath = Join-Path -Path $DestinationPath -ChildPath "manifest.json"
+if ($true -ne (Test-Path $ManifestPath)) {
+    Write-Error "Unable to find manifest.json in app manifest. Is $($AppManifestFile.Name) a valid Teams app?"
+    exit
+}
+
+$ManifestContentsJson = ConvertFrom-Json (Get-Content $ManifestPath -Raw)
+if ($true -eq $ManifestContentsJson.validDomains.Contains($ValidDomain)) {
+    Write-Warning "Manifest file in $($AppManifestFile.Name) already contains validDomain $ValidDomain, no change required"
+    exit
+}
+
+$ManifestContentsJson.validDomains += $ValidDomain
+New-Item -Path $DestinationPath -Name "manifest.json" -ItemType File -Value (ConvertTo-Json -InputObject $ManifestContentsJson -Depth 99) -Force | Out-Null
+
+$BackupPath = Join-Path -Path $AppManifestFile.Directory.FullName -ChildPath "Temp" -AdditionalChildPath "Backup"
+New-Item -Path $BackupPath -ItemType Directory -Force | Out-Null
+
+if ($true -ne $NoBackup) {
+    $BackupFileDestination = Join-Path -Path $BackupPath -ChildPath $AppManifestFile.Name
+    Write-Output "Backing up $($AppManifestFile.Name) to $($BackupFileDestination.Replace($AppManifestFile.Directory.FullName, "."))"
+    Move-Item $AppManifestFile.FullName -Destination $BackupFileDestination -Force
+}
+
+Write-Output "Updating $($AppManifestFile.Name) with additional ValidDomain $ValidDomain"
+Compress-Archive -DestinationPath $AppManifestFile.FullName -LiteralPath (Get-ChildItem $DestinationPath -Depth 1) -Force
+
+if ($true -ne $KeepTempFolder) {
+    Remove-Item -Path $BackupPath -Recurse
+}