diff --git a/src/WebAPI/OData/Client.php b/src/WebAPI/OData/Client.php
index b5ebf271..8d07b349 100644
--- a/src/WebAPI/OData/Client.php
+++ b/src/WebAPI/OData/Client.php
@@ -194,8 +194,11 @@ private function doRequest( string $method, string $url, $data = null, array $he
             $headers = array_merge( [ 'Content-Type' => 'application/json' ], $headers );
         }
 
-        if ( $this->settings->callerID !== null ) {
-            $headers = array_merge( [ 'MSCRMCallerID' => '$this->settings->callerID' ], $headers );
+        if ( $this->settings->callerObjectId !== null ) {
+            $headers = array_merge( [ 'CallerObjectId' => $this->settings->callerObjectId ], $headers );
+        }
+        elseif ( $this->settings->callerID !== null ) {
+            $headers = array_merge( [ 'MSCRMCallerID' => $this->settings->callerID ], $headers );
         }
 
         try {
diff --git a/src/WebAPI/OData/Settings.php b/src/WebAPI/OData/Settings.php
index 1fe5dd6b..73c8ed96 100644
--- a/src/WebAPI/OData/Settings.php
+++ b/src/WebAPI/OData/Settings.php
@@ -75,12 +75,19 @@ abstract class Settings implements LoggerAwareInterface {
     public LoggerInterface $logger;
 
     /**
-     * ID of the user to impersonate during calls.
-     *
+     * ID of the user (systemuserid) to impersonate during calls.
+     * @deprecated
      * Null value means impersonation is not performed.
      */
     public ?string $callerID = null;
 
+    /**
+     * Microsoft Entra ID object ID - azureactivedirectoryobjectid
+     *
+     * Null value means impersonation is not performed.
+     */
+    public ?string $callerObjectId = null;
+
     /**
      * Settings constructor.
      */