Social importer not importing from Facebook (Error 100)

I’m not able to get the Social Importer plugin to work.

When trying to “Import Details from Social” for a new event, I enter the FB URL and get this response:

“Something went wrong[100], this page/event may not be public”

However, the event IS public.

Here is a screenshot: https://cl.ly/1q3t342q0c3Q

And here is the URL of the FB event:

https://www.facebook.com/events/795569210646634/

(which you can access from an incognito Chrome browser (i.e. not logged in to FB, so it IS a public event)

Here is a screen of my app settings on GeoDirectory: https://cl.ly/2B1r3x31220y

Any thoughts/help?