Can’t connect to Facebook

I hit publish on a post and came up against a message saying,

“Before you hit Publish, please refresh the following connection(s) to make sure we can publicise your post:

Refresh connection with Facebook”

I clicked on the link and it took me to the Marketing and Integration page. It asked me to reconnect with Facebook. My Facebook profile box appeared, then went, and I get a message saying there is an issue connecting to Facebook.

I looked here and see that there has been a problem in the past, but it seems to be from a while ago. Is there a fix? Can anyone help?