Posts under category Facebook Instagram Graph API

Hello,
Some comments to IG posts are not delivered to our webhook API. We couldn't find a pattern of how the comments are not delivered but it still leads to a missing data issue.
An evident example of this issue: https://www.instagram.com/p/C3C-P_moj41/
Could you please help to overcome this issue? Our API is up and running without any downtime.
Thanks!

https://developers.facebook.com/docs/instagram-basic-display-api/guides/long-lived-access-tokens Followed this guide and try to exchanged the token, this endpoint "https://graph.instagram.com/access_token?grant_type=ig_exchange_token" is returning an empty response without giving me back a 400
I wonder whats going on with the endpoint. It used to work, but stopped working today, is it because the APP is in review and the dev mode is on? In the past it used to work. (my APP has the "instagram_graph_user_profile" permission already )

this query works: https://developers.facebook.com/tools/explorer/?method=GET&path=18025325167778997%3Ffiel[…]type)%7Bid%2Cname%2Cvalues%2Ctotal_value%7D&version=v19.0
This does not work: https://developers.facebook.com/tools/explorer/?method=GET&path=18025325167778997%3Ffields%3Did%2Cinsights.metric(impressions%2Creach%2Cshares%2Cnavigation).breakdown(story_navigation_action_type)%7Bid%2Cname%2Cvalues%2Ctotal_value%7D&version=v19.0
Why do I get an error (#100) Incompatible breakdowns (story_navigation_action_type) for metric (shares)?
Why can't I combine breakdowns like this: insights.metric(impressions,reach,shares,navigation,profile_activity).breakdowns(story_navigation_action_type,action_type)
Here is your own documentation: https://developers.facebook.com/docs/instagram-api/reference/ig-media/insights#breakdown