Posts under category Facebook Graph API

I have an app that was approved two years ago. I just did the data checkup following this I'm not able to authenticate new users. It seems like something has broken with the Authentication for instagram accounts through the business API.
I know there was the recent rollout of the new Instagram API so I'm not sure if there have been breaking changes with this.

Using the below end point my page token returns posts from the page:
https://graph.facebook.com/v18.0/{PAGEID}/feed?fields=id,created_time,message,status_type,from,place,picture,attachments&limit=100&access_token={TOKEN}
If I then take the post id from this return and try and get comments for it using the following end point I am getting (#200) Missing Permissions. https://graph.facebook.com/v18.0/{POSTID}/comments?limit=100&fields=created_time,from,comment_count,message,attachment&access_token={TOKEN}&order=chronological
But I am not being told what permissions are missing, and why I cannot get comments. This is also not always the case, this exact scenario works in many other cases, so there is an issue somewhere with the access of the user/page, rather than my process..... But I have no idea what, or how to find out.
If I look at the permission in the access token using the token access debugger tool, we have the following: pages_show_list, business_management, pages_read_engagement, pages_read_user_content, pages_manage_posts, public_profile
and my understanding from reading the documentation is that I just need this one: pages_read_user_content to read comments.
I am so confused.
Any help or suggestions of things I can try would be greatly appreciated. if only the error was more useful, and told me what I was missing, I could have a better idea of how to fix.
Thanks in advance

We have always used this "IMPRESSION" parameter to retrieve data for Instagram posts, and it has worked successfully in the past, but today it suddenly returned an error.
Is it deprecated from the API? And is there any new data point that can replace it? Many thanks!

All players using the Facebook Canvas version of our app are receiving the following message:
Jimmy's Cartel Poker is unavailable Sorry, this game can't be played right now.
Seems to show up on other Canvas games I've tried too.
Unable to create any bug reports in the Support page.
Can anyone help here?
Thank you.