Cannot load custom modal

Hello everyone

I have a problem with the creation of my Custom Modal application,
I followed all the explanation of the documentation to display my iframe but it does not work.

I am using react here is the code

I’s my React iframe component

  const initializeSdk = async () => {
    const sdk = await new AppExtensionsSDK().initialize();

    const { status } = await sdk.execute(Command.OPEN_MODAL, {
      type: Modal.CUSTOM_MODAL,
      action_id: '6ccd4269-e676-496f-91cb-6069c9567290'

  useEffect(() => {
  }, []);

an example of behavior


Someone can help me ?