Auto-Subscribe author with form builder

I’ve got a situation where I have a community that uses front-end forms to create posts in different post types. Users input and manage their posts entirely on the front-end. For this, we are using Formidable Forms Pro. Users in the community site are not using the Author user role, we have them configured all as Subscribers and are able to post content through the various Formidable forms.

I do have Subscribe Authors set to Yes, however, it does not work. From Formidable’s side, the posts are all correctly attributed to the users who author them. My assumption is that because we are using the front-end forms, possibly along with the fact that everyone is a subscriber, that the feature in StCR isn’t working.

Would be possible to find a way to make work? Any ideas on how ensure that our content writers get subscribed to the comments?