diff --git a/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psd1 b/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psd1
index a1b08ff..610cf04 100644
--- a/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psd1
+++ b/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psd1
@@ -34,7 +34,7 @@ RequiredModules = @(
 )
 
 # Functions to export from this module
-FunctionsToExport = @('Connect-SsoAdminServer', 'Disconnect-SsoAdminServer', 'New-PersonUser', 'Get-PersonUser', 'Set-PersonUser', 'Remove-PersonUser', 'Get-Group', 'Get-PasswordPolicy', 'Set-PasswordPolicy', 'Get-LockoutPolicy', 'Set-LockoutPolicy', 'Get-TokenLifetime', 'Set-TokenLifetime')
+FunctionsToExport = @('Connect-SsoAdminServer', 'Disconnect-SsoAdminServer', 'New-PersonUser', 'Get-PersonUser', 'Set-PersonUser', 'Remove-PersonUser', 'Get-Group', 'Get-PasswordPolicy', 'Set-PasswordPolicy', 'Get-LockoutPolicy', 'Set-LockoutPolicy', 'Get-TokenLifetime', 'Set-TokenLifetime', 'Add-ActiveDirectoryIdentitySource')
 
 # Cmdlets to export from this module
 CmdletsToExport = @()
diff --git a/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psm1 b/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psm1
index b6f39e2..2748b09 100644
--- a/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psm1
+++ b/Modules/VMware.vSphere.SsoAdmin/VMware.vSphere.SsoAdmin.psm1
@@ -289,7 +289,7 @@ function New-PersonUser {
    $Server)
 
    Process {
-      $serversToProcess = $global:DefaultSsoAdminServers
+      $serversToProcess = $global:DefaultSsoAdminServers.ToArray()
       if ($Server -ne $null) {
          $serversToProcess = $Server
       }
@@ -369,7 +369,7 @@ function Get-PersonUser {
    $Server)
 
    Process {
-      $serversToProcess = $global:DefaultSsoAdminServers
+      $serversToProcess = $global:DefaultSsoAdminServers.ToArray()
       if ($Server -ne $null) {
          $serversToProcess = $Server
       }
@@ -654,7 +654,7 @@ function Get-Group {
    $Server)
 
    Process {
-      $serversToProcess = $global:DefaultSsoAdminServers
+      $serversToProcess = $global:DefaultSsoAdminServers.ToArray()
       if ($Server -ne $null) {
          $serversToProcess = $Server
       }
@@ -726,7 +726,7 @@ function Get-PasswordPolicy {
    $Server)
 
    Process {
-      $serversToProcess = $global:DefaultSsoAdminServers
+      $serversToProcess = $global:DefaultSsoAdminServers.ToArray()
       if ($Server -ne $null) {
          $serversToProcess = $Server
       }
@@ -976,7 +976,7 @@ function Get-LockoutPolicy {
    $Server)
 
    Process {
-      $serversToProcess = $global:DefaultSsoAdminServers
+      $serversToProcess = $global:DefaultSsoAdminServers.ToArray()
       if ($Server -ne $null) {
          $serversToProcess = $Server
       }
@@ -1128,7 +1128,7 @@ function Get-TokenLifetime {
    $Server)
 
    Process {
-      $serversToProcess = $global:DefaultSsoAdminServers
+      $serversToProcess = $global:DefaultSsoAdminServers.ToArray()
       if ($Server -ne $null) {
          $serversToProcess = $Server
       }
@@ -1208,4 +1208,160 @@ function Set-TokenLifetime {
       }
    }
 }
+#endregion
+
+#region IdentitySource
+function Add-ActiveDirectoryIdentitySource {
+<#
+   .NOTES
+   ===========================================================================
+   Created on:   	9/30/2020
+   Created by:   	Dimitar Milov
+    Twitter:       @dimitar_milov
+    Github:        https://github.com/dmilov
+   ===========================================================================
+   .DESCRIPTION
+   This function adds Identity Source of ActiveDirectory type.
+
+   .PARAMETER Name
+   Name of the identity source
+
+   .PARAMETER DomainName
+   Domain name
+
+   .PARAMETER DomainAlias
+   Domain alias
+
+   .PARAMETER PrimaryUrl
+   Primary Server URL
+
+   .PARAMETER BaseDNUsers
+   Base distinguished name for users
+
+   .PARAMETER BaseDNGroups
+   Base distinguished name for groups
+
+   .PARAMETER Username
+   Domain authentication user name
+
+   .PARAMETER Passowrd
+   Domain authentication password
+
+   .PARAMETER Server
+   Specifies the vSphere Sso Admin Server on which you want to run the cmdlet.
+   If not specified the servers available in $global:DefaultSsoAdminServers variable will be used.
+
+   .EXAMPLE
+   Add-ActiveDirectoryIdentitySource `
+      -Name 'sof-powercli' `
+      -DomainName 'sof-powercli.vmware.com' `
+      -DomainAlias 'sof-powercli' `
+      -PrimaryUrl 'ldap://sof-powercli.vmware.com:389' `
+      -BaseDNUsers 'CN=Users,DC=sof-powercli,DC=vmware,DC=com' `
+      -BaseDNGroups 'CN=Users,DC=sof-powercli,DC=vmware,DC=com' `
+      -Username 'sofPowercliAdmin' `
+      -Password '$up3R$Tr0Pa$$w0rD'
+
+   Adds ActiveDirectory identity source
+#>
+[CmdletBinding()]
+ param(
+   [Parameter(
+      Mandatory=$true,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false,
+      HelpMessage='Friendly name of the identity source')]
+   [ValidateNotNull()]
+   [string]
+   $Name,
+
+   [Parameter(
+      Mandatory=$true,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false)]
+   [ValidateNotNull()]
+   [string]
+   $DomainName,
+
+   [Parameter(
+      Mandatory=$false,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false)]
+   [string]
+   $DomainAlias,
+
+   [Parameter(
+      Mandatory=$true,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false)]
+   [ValidateNotNull()]
+   [string]
+   $PrimaryUrl,
+
+   [Parameter(
+      Mandatory=$true,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false,
+      HelpMessage='Base distinguished name for users')]
+   [ValidateNotNull()]
+   [string]
+   $BaseDNUsers,
+
+   [Parameter(
+      Mandatory=$true,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false,
+      HelpMessage='Base distinguished name for groups')]
+   [ValidateNotNull()]
+   [string]
+   $BaseDNGroups,
+
+   [Parameter(
+      Mandatory=$true,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false,
+      HelpMessage='Domain authentication user name')]
+   [ValidateNotNull()]
+   [string]
+   $Username,
+
+   [Parameter(
+      Mandatory=$true,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false,
+      HelpMessage='Domain authentication password')]
+   [ValidateNotNull()]
+   [string]
+   $Password,
+
+   [Parameter(
+      Mandatory=$false,
+      ValueFromPipeline=$false,
+      ValueFromPipelineByPropertyName=$false,
+      HelpMessage='Connected SsoAdminServer object')]
+   [ValidateNotNull()]
+   [VMware.vSphere.SsoAdminClient.DataTypes.SsoAdminServer]
+   $Server)
+
+   $serversToProcess = $global:DefaultSsoAdminServers.ToArray()
+   if ($Server -ne $null) {
+      $serversToProcess = $Server
+   }
+   foreach ($connection in $serversToProcess) {
+      if (-not $connection.IsConnected) {
+         Write-Error "Server $connection is disconnected"
+         continue
+      }
+
+      $connection.Client.AddActiveDirectoryExternalDomain(
+         $DomainName,
+         $DomainAlias,
+         $Name,
+         $PrimaryUrl,
+         $BaseDNUsers,
+         $BaseDNGroups,
+         $Username,
+         $Password);
+   }
+}
 #endregion
\ No newline at end of file
diff --git a/Modules/VMware.vSphere.SsoAdmin/net45/VMware.vSphere.SsoAdminClient.dll b/Modules/VMware.vSphere.SsoAdmin/net45/VMware.vSphere.SsoAdminClient.dll
index ccd44ab..f8c8d14 100644
Binary files a/Modules/VMware.vSphere.SsoAdmin/net45/VMware.vSphere.SsoAdminClient.dll and b/Modules/VMware.vSphere.SsoAdmin/net45/VMware.vSphere.SsoAdminClient.dll differ
diff --git a/Modules/VMware.vSphere.SsoAdmin/netcoreapp2.0/VMware.vSphere.SsoAdminClient.dll b/Modules/VMware.vSphere.SsoAdmin/netcoreapp2.0/VMware.vSphere.SsoAdminClient.dll
index 744f948..764d165 100644
Binary files a/Modules/VMware.vSphere.SsoAdmin/netcoreapp2.0/VMware.vSphere.SsoAdminClient.dll and b/Modules/VMware.vSphere.SsoAdmin/netcoreapp2.0/VMware.vSphere.SsoAdminClient.dll differ
diff --git a/Modules/VMware.vSphere.SsoAdmin/src/VMware.vSphere.SsoAdmin.Client/VMware.vSphere.SsoAdminClient/SsoAdminClient.cs b/Modules/VMware.vSphere.SsoAdmin/src/VMware.vSphere.SsoAdmin.Client/VMware.vSphere.SsoAdminClient/SsoAdminClient.cs
index c7caac1..ec44174 100644
--- a/Modules/VMware.vSphere.SsoAdmin/src/VMware.vSphere.SsoAdmin.Client/VMware.vSphere.SsoAdminClient/SsoAdminClient.cs
+++ b/Modules/VMware.vSphere.SsoAdmin/src/VMware.vSphere.SsoAdmin.Client/VMware.vSphere.SsoAdminClient/SsoAdminClient.cs
@@ -5,6 +5,7 @@
 using System;
 using System.Collections.Generic;
 using System.IdentityModel.Selectors;
+using System.Runtime.InteropServices.WindowsRuntime;
 using System.Security;
 using System.ServiceModel;
 using System.ServiceModel.Channels;
@@ -617,6 +618,44 @@ namespace VMware.vSphere.SsoAdminClient
 
          return GetTokenLifetime();
       }
+
+      public void AddActiveDirectoryExternalDomain(
+         string domainName,
+         string domainAlias,
+         string friendlyName,
+         string primaryUrl,
+         string baseDNUsers,
+         string baseDNGroups,
+         string authenticationUserName,
+         string authenticationPassword) {
+
+         string serverType = "ActiveDirectory";
+         string authenticationType = "password";
+         var authorizedInvocationContext =
+            CreateAuthorizedInvocationContext();
+
+         authorizedInvocationContext.
+         InvokeOperation(() =>
+            _ssoAdminBindingClient.AddExternalDomainAsync(
+               new ManagedObjectReference {
+                  type = "SsoAdminConfigurationManagementService",
+                  Value = "configurationManagementService"
+               },
+               serverType,
+               domainName,
+               domainAlias,
+               new SsoAdminExternalDomainDetails {
+                  friendlyName = friendlyName,
+                  primaryUrl = primaryUrl,
+                  userBaseDn = baseDNUsers,
+                  groupBaseDn = baseDNGroups
+               },
+               authenticationType,
+               new SsoAdminDomainManagementServiceAuthenticationCredentails {
+                  username = authenticationUserName,
+                  password = authenticationPassword
+               })).Wait();
+      }
       #endregion
    }
 }