I have comments enabled under settings > discussion. There is a leave comment section at the bottom of each post. When anyone tries to leave a comment, it will say submitting comment and start spinning for about 3 seconds, then disappear as if the comment has been submitted for approval.
I have also tried commenting on the post(s) myself to see if it would submit a comment to the admin approval section. It does not work. No comments are waiting to be approved.
Comments have been posted in the past. The last comment that was posted was 11/07/2018.