[Easyblog 5.1.8] Unable to turn on the Facebook comment

Hi,

I want to enable the Facebook comment on my website.
However, after I follow the procedure listed in the document (app id, admin id and turn on)
https://stackideas.com/docs/easyblog/administrators/comments/integrating-with-facebook-comments

I am still not able to turn on this function, could you kindly help to see if anything went wrong or any possible root cause on my website?

Thank you,
Alan