diff --git a/src/Resources/Resources/ActiveDirectory/Models/ActiveDirectoryClient.cs b/src/Resources/Resources/ActiveDirectory/Models/ActiveDirectoryClient.cs
index c16fba68f13a..78f459c7a3fb 100644
--- a/src/Resources/Resources/ActiveDirectory/Models/ActiveDirectoryClient.cs
+++ b/src/Resources/Resources/ActiveDirectory/Models/ActiveDirectoryClient.cs
@@ -212,7 +212,7 @@ public IEnumerable<PSADUser> FilterUsers(ADObjectFilterOptions options, int firs
         /// </summary>
         public PSADObject GetObjectByObjectId(string objectId)
         {
-            return GraphClient.DirectoryObjects.GetDirectoryObject(objectId)?.ToPSADObject();
+            return string.IsNullOrEmpty(objectId) ? null : GraphClient.DirectoryObjects.GetDirectoryObject(objectId)?.ToPSADObject();
         }
 
         /// <summary>
diff --git a/src/Resources/Resources/ChangeLog.md b/src/Resources/Resources/ChangeLog.md
index da394d9a2902..896b226d2d02 100644
--- a/src/Resources/Resources/ChangeLog.md
+++ b/src/Resources/Resources/ChangeLog.md
@@ -19,6 +19,7 @@
 -->
 
 ## Upcoming Release
+* Fixed query issue when objectId in assignment is empty for `Get-DenyAssignment`
 * Fixed an issue where running deployment cmdlets with `-WhatIf` throws exception when formatting results with nested array changes
 
 ## Version 6.5.1
diff --git a/src/Resources/Resources/Models.Authorization/AuthorizationClientExtensions.cs b/src/Resources/Resources/Models.Authorization/AuthorizationClientExtensions.cs
index b82d176f5e2f..277193a29c68 100644
--- a/src/Resources/Resources/Models.Authorization/AuthorizationClientExtensions.cs
+++ b/src/Resources/Resources/Models.Authorization/AuthorizationClientExtensions.cs
@@ -182,7 +182,7 @@ public static IEnumerable<PSRoleAssignment> ToPSRoleAssignments(this IEnumerable
             List<PSADObject> adObjects = null;
             try
             {
-                adObjects = objectIds.Count > 1 ? activeDirectoryClient.GetObjectsByObjectIds(objectIds) : new List<PSADObject>() { activeDirectoryClient.GetObjectByObjectId(objectIds.FirstOrDefault()) };
+                adObjects = GetAdObjectsByObjectIds(objectIds, activeDirectoryClient);
             }
             catch (Common.MSGraph.Version1_0.DirectoryObjects.Models.OdataErrorException)
             {
@@ -222,6 +222,21 @@ public static IEnumerable<PSRoleAssignment> ToPSRoleAssignments(this IEnumerable
             return psAssignments;
         }
 
+        private static List<PSADObject> GetAdObjectsByObjectIds(List<string> objectIds, ActiveDirectoryClient activeDirectoryClient)
+        {
+            if (null == objectIds || 0 == objectIds.Count())
+            {
+                return new List<PSADObject>();
+            }
+            else if (1 == objectIds.Count())
+            {
+                return new List<PSADObject>() { activeDirectoryClient.GetObjectByObjectId(objectIds.FirstOrDefault()) };
+            }else
+            {
+                return activeDirectoryClient.GetObjectsByObjectIds(objectIds);
+            }
+        }
+
         private static IEnumerable<PSPrincipal> ToPSPrincipals(this IEnumerable<Principal> principals, IEnumerable<PSADObject> adObjects)
         {
             var psPrincipals = new List<PSPrincipal>();
@@ -265,7 +280,7 @@ public static PSDenyAssignment ToPSDenyAssignment(this DenyAssignment assignment
 
             try
             {
-                adObjects = objectIds.Count() <= 1 ? new List<PSADObject>() { activeDirectoryClient.GetObjectByObjectId(objectIds.FirstOrDefault()) } : activeDirectoryClient.GetObjectsByObjectIds(objectIds);
+                adObjects = GetAdObjectsByObjectIds(objectIds, activeDirectoryClient);
             }
             catch (Common.MSGraph.Version1_0.DirectoryObjects.Models.OdataErrorException)
             {
@@ -306,7 +321,7 @@ public static IEnumerable<PSDenyAssignment> ToPSDenyAssignments(this IEnumerable
             List<PSADObject> adObjects = null;
             try
             {
-                adObjects = objectIds.Count() <= 1 ? new List<PSADObject>() { activeDirectoryClient.GetObjectByObjectId(objectIds.FirstOrDefault()) } : activeDirectoryClient.GetObjectsByObjectIds(objectIds);
+                adObjects = GetAdObjectsByObjectIds(objectIds, activeDirectoryClient);
             }
             catch (Common.MSGraph.Version1_0.DirectoryObjects.Models.OdataErrorException)
             {