Can you try download my attached file and replace into this following file

JoomlaFolder/administrator/components/com_easyblog/includes/oauth/adapters/facebook/client.php

Then click revoke access button from your backend Facebook autopost page then re-sign in via Facebook again and see how it goes?

If the issue still persists, can you provide us with your Facebook and FTP access so we can better have a check?

I was having the same issue and this fixed the problem for me. Thank you!

Hey Douglas, glad to heard your issue resolved.