we found facebook change the permission requirements for posting to pages from just manage_pages to require both manage_pages and publish_pages. by granting both permissions we solved our problem
in essence we had to pass the client to https://www.facebook.com/dialog/oauth?client_id=client_id&redirect_uri=redirect_uri&scope=manage_pages,publish_pages&response_type=code%20token&enable_profile_selector=1&profile_selector_ids=pageid
we found facebook change the permission requirements for posting to pages from just manage_pages to require both manage_pages and publish_pages. by granting both permissions we solved our problem
in essence we had to pass the client to https://www.facebook.com/dialog/oauth?client_id=client_id&redirect_uri=redirect_uri&scope=manage_pages,publish_pages&response_type=code%20token&enable_profile_selector=1&profile_selector_ids=pageid
