Facebook chat is not working

Hi,
Many thanks to your great plugin. I have a small confusing issue with Facebook chat button. Im following this website to get my fanpage ID https://lookup-id.com/. Then I added the id in plugin setting page. But there is no Facebook chat displayed on website. I also checked the console tab. There is no error occurred.

I have no idea how to resolve this problem. Any help is appreciated!

Thank you!

The page I need help with: [log in to see the link]