Getting "(#100) Pages Public Content Access requires either app secret proof or an app token" issue when calling Facebook API?

Question

I am developing an app that syncs with users Facebook account and fetches Facebook page information. Initially, app asks for Login with Facebook and gets page list. After getting pages I am calling API to get posts associated with each page. Once I get post details then I am calling insight APIs to get insights of each post. This flow working fine with development mode but when I switch to Live mode I am getting the following error

      Client error: `GET https://graph.facebook.com/v4.0/100575944711552/feed` resulted in a `400 Bad Request` response:{"error":{"message":"(#100) Pages Public Content Access requires either app secret proof or an app token","type":"OAuthE (truncated...)
 {"userId":1,"email":"[email protected]","exception":"[object] (GuzzleHttp\\Exception\\ClientException(code: 400): Client error: `GET https://graph.facebook.com/v4.0/100575944711552/feed` resulted in a `400 Bad Request` response:
{\"error\":{\"message\":\"(#100) Pages Public Content Access requires either app secret proof or an app token\",\"type\":\"OAuthE (truncated...)

From the details what I observed I am getting this error while using,

GET /v5.0/{page-id}/feed HTTP/1.1
Host: graph.facebook.com

this endpoint. I am currently having 2 permissions approved,

1. manage_pages 2. read_insights and app review team rejected 2 permissions saying the request is invalid and for this use case we don't require this which are, 1.Page Mentions 2. user_posts

Can anyone help me to understand what is the exact issue?

Answer 1

I had the same problem. Upon reacting to their damn changes yet again (manage_pages is not a thing anymore). I only had pages_manage_metadata but not pages_read_engagement to actually read the content on the page... -.-