Posts under category Meta & Facebook

Hello! I'm trying to query the {page-post-id}/insights endpoint to retrieve metrics for facebook stories. My problem is that all post metrics I try return an incorrect value of 0.
Details about the page-post-id For the page post id, I'm using a string "{page_id}{media_id}". I've tried using {page_id}{post_id} as recommended by the docs, where the post_id is the value associated with the post key returned from the page/stories endpoint, but this alway yields a 400. Using the media_id returned from page/stories, I'm able to successfully query the story.
Details about the metrics I've tried to get nearly all metrics that are prefixed with "post_". All have returned 0, which I know to not be the correct value.
I've also tried retrieving specific metrics using {page-post-id}/reactions to no avail. Has anyone else run into this issue and found a workaround? Thanks!

I've doing such things since more than 2 decades. But the experience with the meta app review team is the worst I ever had.
My app is rejected since weeks. They simply don't give me helpful informations. When I'm (and others from the team) testing the app with the test user provided, it simply works. But the review team constantly rejecting with the reason the login throws an error.
We are playing ping-pong since weeks - at least 20 submits/rejects.
What can I do? Is there a possibility to get any proper feedback, like a screenshot or screencast to see what they do.