On 10th July macmanx said it was being looked into. Did you find anything, is there a solution. I travel a lot and have to schedule my posts to publish while away so this when it worked was ideal, now it is just a pain!!!
If reconnecting doesn’t resolve your issue,
Go to your Facebook profile > App Center > My Apps > Remove your WordPress.com App.
Now reconnect your WordPress account to Facebook and allow WordPress.com App.