This feature request is being reviewed by the feature team. No new details to share at this time.
Meanwhile, feel free to share why you need this in class teams / staff teams, and what you need to see (ie # read / list of users read / timestamp of read) and for what purpose.
Gordon Chang from Teams
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As a teacher this would be helpful so I know which students I need to follow up with (ie, those who have not seen the post, those who consistently are not accessing Teams, etc).