I use the bricks comment form, but the notify me when there is a response box does not appear. Without this box, the commenter will not receive a response to their comment.
Maybe, as temporary solution use a plugin like: Comment Reply Email Notification – Extension WordPress | WordPress.org Français
The notification box only appears when I am logged in as an administrator, it does not appear for visitors.
I don’t quite understand your question (my native language is not English), but it seems this is the same problem that I reported earlier.
I have already installed the Comment Reply Email Notification plugin.
But the “notify me when there is a response” box does not appear for visitors, you have to log in to the website.