Ludwig, I just discovered that Facebook Closed Group auto-posting is broken again, even with API 4.3.7. Posting to my timeline and page continue to work fine, but posting to my group results in this feedback from Facebook. Sorry I couldn’t print the whole thing, but even when using code formatting tags, your site refuses to let me post it, and gives me a 403 error. I will send the whole error message via email, if you like. Please let me know:
ERROR FB #5:https://www.facebook.com/groups/421139931640702/
Array ( [headers] => Array ( [x-frame-options] => DENY [content-security-policy]