Your Scope must provide you the ability to perform tasks. The scope are the permissions and features of your app as requested in App Review. For a better experience and the ability to use all InstagramConnectorforBusiness Server Actions, choose Scope as "instagram_basic,pages_show_list,instagram_manage_insights,
instagram_manage_comments,instagram_content_publish,pages_read_engagement" and guarantee that you have the Feature Instagram Public Content Access.