Hi, documentation is old and i have some problems to set correctly. I get and error
Invalid Scopes: pages_show_list, pages_read_engagement, pages_read_user_content. This message is only shown to developers. Users of your app will ignore these permissions if present. Please read the documentation for valid permissions at: https://developers.facebook.com/docs/facebook-login/permissions_
I think there is a problem with page that i am administrator and app.
I cannot find the Page here https://developers.facebook.com/tools/explorer/481128808756869/?method=GET&path=me&version=v21.0 but when i try to select Get Page access Token i see this error above.