diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab8076be04..ad8f07468f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 # UNRELEASED
 
+* AADServicePrincipal
+  * FIXES [#5549](https://github.com/microsoft/Microsoft365DSC/issues/5549)
 * AADDeviceRegistrationPolicy
   * Fixes an error when trying to disable AAD join.
 * FabricAdminTenantSettings
diff --git a/Modules/Microsoft365DSC/DSCResources/MSFT_AADServicePrincipal/MSFT_AADServicePrincipal.psm1 b/Modules/Microsoft365DSC/DSCResources/MSFT_AADServicePrincipal/MSFT_AADServicePrincipal.psm1
index 0ec87681ed..cc05842a86 100644
--- a/Modules/Microsoft365DSC/DSCResources/MSFT_AADServicePrincipal/MSFT_AADServicePrincipal.psm1
+++ b/Modules/Microsoft365DSC/DSCResources/MSFT_AADServicePrincipal/MSFT_AADServicePrincipal.psm1
@@ -309,7 +309,7 @@ function Get-TargetResource
             }
 
             $result = @{
-                AppId                              = $appInstance.DisplayName
+                AppId                              = $AADServicePrincipal.AppId
                 AppRoleAssignedTo                  = $AppRoleAssignedToValues
                 ObjectID                           = $AADServicePrincipal.Id
                 DisplayName                        = $AADServicePrincipal.DisplayName
diff --git a/Tests/Unit/Microsoft365DSC/Microsoft365DSC.AADServicePrincipal.Tests.ps1 b/Tests/Unit/Microsoft365DSC/Microsoft365DSC.AADServicePrincipal.Tests.ps1
index d603524a7d..b00ef17dec 100644
--- a/Tests/Unit/Microsoft365DSC/Microsoft365DSC.AADServicePrincipal.Tests.ps1
+++ b/Tests/Unit/Microsoft365DSC/Microsoft365DSC.AADServicePrincipal.Tests.ps1
@@ -215,7 +215,7 @@ Describe -Name $Global:DscHelper.DescribeHeader -Fixture {
         Context -Name 'The app exists and values are already in the desired state' -Fixture {
             BeforeAll {
                 $testParams = @{
-                    AppId                     = 'App1'
+                    AppId                     = 'b4f08c68-7276-4cb8-b9ae-e75fca5ff834'
                     DisplayName               = 'App1'
                     AlternativeNames          = 'AlternativeName1', 'AlternativeName2'
                     AccountEnabled            = $true