I'm trying to post on a page, after updating to version 9.0 of the Facebook api, but the message below is appearing, I have already changed to 9.0 within Facebook developers, and put the permissions:
pages_read_engagement, pages_manage_posts, pages_show_list, publish_video
(#200) if posting to a group, requires app being installed in the group,
and \ either publish_to_groups permission with user token, or both pages _read_engagement \
and pages_manage_posts permission with page token; if posting to a page, \ requires both pages_read_engagement and
pages_manage_posts as an admin with \ sufficient administrative permission