diff --git a/src/Objects/AcsCredentialWarnings.php b/src/Objects/AcsCredentialWarnings.php
index 3c0cc1a..06049b4 100644
--- a/src/Objects/AcsCredentialWarnings.php
+++ b/src/Objects/AcsCredentialWarnings.php
@@ -10,16 +10,16 @@ public static function from_json(mixed $json): AcsCredentialWarnings|null
             return null;
         }
         return new self(
+            created_at: $json->created_at,
             message: $json->message,
-            warning_code: $json->warning_code,
-            created_at: $json->created_at ?? null
+            warning_code: $json->warning_code
         );
     }
 
     public function __construct(
+        public string $created_at,
         public string $message,
-        public string $warning_code,
-        public string|null $created_at
+        public string $warning_code
     ) {
     }
 }