Posts under category Facebook Graph API

We encounter an issue when it comes to requesting a specific post. It's about an ads-post.
When trying to fetch it by using the page-access token it is not delivered via feed or ads_posts endpoint (while those endpoints return other posts) and when requesting it by ID, the API returns
"Unsupported get request. Object with ID '92204367377_756443629857480' does not exist, cannot be loaded due to missing permissions, or does not support this operation. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api"
I only got the post ID by a webhook about a comment added to this post. And also interesting: i can successfully request the comment.
Did anyone else encounter such a problem and can provide a solution for it?
Best regards
Martin

We have thus far used the page_engaged_users metric to determine Facebook Pages rate limits as stated in the documentation: https://developers.facebook.com/docs/graph-api/overview/rate-limiting/#pages (number of engaged users is required).
We have also received a notification: https://developers.facebook.com/docs/pages-api/changelog/ that this metric is planned for deprecation in March, 2024.
Is there an alternative metric to get the number of engaged users?