Facebook webhook for leadgen - Can't retrieve Facebook Lead Ads

_x000D_ _x000D_ I follow this Facebook's guide: https://www.facebook.com/marketingdevelopers/videos/883648801749520/ I set up successfully all these steps: In the "developers.facebook.com/apps/APP-ID", I add "webhooks" product and create subscription to page and subscribe to leadgen, In addition, I verified my callback_url successfully I create a new page that used Facebook Javascript SDK and I send a post request using FB.api with the user page access token to the page subscribed_apps and the API returns me "{success:true}", I double checked if that worked with the Facebook graph by sending the same request just with GET method and it return me and object that looks like that: { "data": [ { "link": "https://www.my-url.com/", "name": "my app name", "id": "my app id" } ] } Now, all I had to do is to send a test to my lead ad and get an update notification to my callback_url which is https://www.my-domain.com/admin/webhook I tried 2 different ways, the first is from my app subscription, I don't get any error but nothing happened the second way was with "Lead ads testing tool" https://developers.facebook.com/tools/lead-ads-testing and I'm receiving an error with error code 301 that says "rejected"