diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64b7fad18..9105ba554 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - SharePointDsc
   - Added logging to the event log when the code throws an exception
+  - Added support for trusted domains to Test-SPDscIsADUser helper function
+- SPInstall
+  - Added documentation about a SharePoint 2019 installer issue
 
 ### Changed
 
diff --git a/SharePointDsc/DSCResources/MSFT_SPInstall/Readme.md b/SharePointDsc/DSCResources/MSFT_SPInstall/Readme.md
index f77a487ac..8a8e10e56 100644
--- a/SharePointDsc/DSCResources/MSFT_SPInstall/Readme.md
+++ b/SharePointDsc/DSCResources/MSFT_SPInstall/Readme.md
@@ -20,6 +20,28 @@ stream is added to indicate that the file is potentially from an unsafe source.
 To use these files, make sure you first unblock them using Unblock-File.
 SPInstall will throw an error when it detects the file is blocked.
 
+NOTE 3:
+The SharePoint 2019 installer has an issue with the Visual C++ Redistributable.
+The Prerequisites Installer accepts a lower version than the SharePoint Setup
+requires, resulting in the setup throwing an error message. The solution is to
+download the most recent version of the Redistributable and using the Package
+resource to install it through DSC:
+
+```PowerShell
+Package 'Install_VC2017ReDistx64'
+{
+    Name       = 'Microsoft Visual C++ 2015-2019 Redistributable (x64) - 14.24.28127'
+    Path       = 'C:\Install\SharePoint\prerequisiteinstallerfiles\vc_redist.x64.exe'
+    Arguments  = '/quiet /norestart'
+    ProductId  = '282975d8-55fe-4991-bbbb-06a72581ce58'
+    Ensure     = 'Present'
+    Credential = $InstallAccount
+}
+```
+
+More information:
+https://docs.microsoft.com/en-us/sharepoint/troubleshoot/installation-and-setup/sharepoint-server-setup-fails
+
 ## Multilingual support
 
 Where possible, resources in SharePointDsc have been written in a way that
diff --git a/SharePointDsc/Modules/SharePointDsc.Util/SharePointDsc.Util.psm1 b/SharePointDsc/Modules/SharePointDsc.Util/SharePointDsc.Util.psm1
index c43b80b0a..3931a37e5 100644
--- a/SharePointDsc/Modules/SharePointDsc.Util/SharePointDsc.Util.psm1
+++ b/SharePointDsc/Modules/SharePointDsc.Util/SharePointDsc.Util.psm1
@@ -1345,33 +1345,46 @@ function Test-SPDscIsADUser
 {
     [OutputType([System.Boolean])]
     [CmdletBinding()]
-    param (
-        [Parameter()]
+    param
+    (
+        [Parameter(Mandatory = $true)]
         [System.String]
         $IdentityName
     )
 
+    $DomainNetbiosName = ""
+
     if ($IdentityName -like "*\*")
     {
+        $DomainNetbiosName = $IdentityName.Split('\')[0]
         $IdentityName = $IdentityName.Substring($IdentityName.IndexOf('\') + 1)
     }
 
-    $searcher = New-Object -TypeName System.DirectoryServices.DirectorySearcher
-    $searcher.filter = "((samAccountName=$IdentityName))"
-    $searcher.SearchScope = "subtree"
-    $searcher.PropertiesToLoad.Add("objectClass") | Out-Null
-    $searcher.PropertiesToLoad.Add("objectCategory") | Out-Null
-    $searcher.PropertiesToLoad.Add("name") | Out-Null
-    $result = $searcher.FindOne()
+    $domainContext = New-Object System.DirectoryServices.ActiveDirectory.DirectoryContext("Domain", $DomainNetbiosName)
+    try
+    {
+        $domain = [System.DirectoryServices.ActiveDirectory.Domain]::GetDomain($domainContext)
+        $root = $domain.GetDirectoryEntry()
+
+        $searcher = [System.DirectoryServices.DirectorySearcher]::new()
+        $searcher.filter = "((samAccountName=$IdentityName))"
+        $searcher.SearchScope = "subtree"
+        $searcher.SearchRoot = $root
+
+        $searcher.PropertiesToLoad.Add("objectClass") | Out-Null
+        $searcher.PropertiesToLoad.Add("objectCategory") | Out-Null
+        $searcher.PropertiesToLoad.Add("name") | Out-Null
+        $result = $searcher.FindOne()
+    }
+    catch
+    {
+        return $false
+    }
 
     if ($null -eq $result)
     {
-        $message = "Unable to locate identity '$IdentityName' in the current domain."
-        Add-SPDscEvent -Message $message `
-            -EntryType 'Error' `
-            -EventID 100 `
-            -Source $MyInvocation.MyCommand.Source
-        throw $message
+        Write-Host "Unable to locate identity '$IdentityName' in the current domain."
+        return $false
     }
 
     if ($result[0].Properties.objectclass -contains "user")