At present we can publish to Facebook with an approved app only.
If the app is not approved with all permissions it will show the error
Invalid Scopes: publish_pages, manage_pages. This message is only shown to developers. Users of your app will ignore these permissions if present.
You have 2 options available in WP Facebook Auto Publish for auto posting to Facebook.
1.Create a facebook app, submit it for approval and use the app. (We can use our own app only after getting approval from Facebook. For getting approval we need to submit the app for approval and it is a complex procedure and it may take upto 3 months to get approval.)
The facebook app creation and submissions details are available in https://help.xyzscripts.com/docs/social-media-auto-publish/faq/how-can-i-create-facebook-application/
If you have trouble in creating screencast/review submission ,please contact our support desk(https://xyzscripts.com/support/) with the necessary login credentials required for App review.
We will submit your App for review.
2.Use a third party approved app (It is a paid service)
If you find it difficult to submit the own facebook app for approval, you can use a third party app (which is a paid service starts from USD 10 per year). The details are available in https://help.xyzscripts.com/docs/social-media-auto-publish/faq/how-can-i-use-the-alternate-solution-for-publishing-posts-to-facebook/
Hope this helps.
Thank you.