Fetch userID and username via Facebook API

I am building an Xcode IOS app.

The purpose of the app is to work with comments under the posts in my own Facebook page.

I have advanced rights for:

1. public_profile
2. email
3. pages_show_list
4. pages_read_user_content
5. pages_read_engagement

When I do a call to the post, I still don’t see the usernames or userIDs.

Question: what access right is missing or what am I doing wrong?

https://graph.facebook.com/v23.0/
{post_id}?fields=comments{from,id}/access_token={access_token}