diff --git a/src/Controller/Component/AuthenticationComponent.php b/src/Controller/Component/AuthenticationComponent.php
index d01f93b8..b3acbc7e 100644
--- a/src/Controller/Component/AuthenticationComponent.php
+++ b/src/Controller/Component/AuthenticationComponent.php
@@ -240,6 +240,16 @@ public function getResult(): ?ResultInterface
         return $this->getAuthenticationService()->getResult();
     }
 
+    /**
+     * Get the identifier (primary key) of the identity.
+     *
+     * @return array|string|int|null
+     */
+    public function getId(): array|string|int|null
+    {
+        return $this->getIdentity()?->getIdentifier();
+    }
+
     /**
      * Returns the identity used in the authentication attempt.
      *
diff --git a/tests/TestCase/Controller/Component/AuthenticationComponentTest.php b/tests/TestCase/Controller/Component/AuthenticationComponentTest.php
index 45d6b4c6..a7d0d007 100644
--- a/tests/TestCase/Controller/Component/AuthenticationComponentTest.php
+++ b/tests/TestCase/Controller/Component/AuthenticationComponentTest.php
@@ -143,6 +143,22 @@ public function testGetAuthenticationServiceInvalidServiceObject()
         $component->getAuthenticationService();
     }
 
+    public function testGetId(): void
+    {
+        $component = new AuthenticationComponent(new ComponentRegistry(new Controller($this->request)));
+        $this->assertNull($component->getId());
+
+        $request = $this->request
+            ->withAttribute('identity', $this->identity)
+            ->withAttribute('authentication', $this->service);
+
+        $controller = new Controller($request);
+        $registry = new ComponentRegistry($controller);
+        $component = new AuthenticationComponent($registry);
+
+        $this->assertSame($component->getId(), $this->identity->getIdentifier());
+    }
+
     /**
      * testGetIdentity
      *