No error display when form submit not successful

We want to use Marketing automative Salesforce connector for Optimizely CMS(Customer Management System) form to connect with our Salesforce platform.

But we find out there are no submission failure show up on CMS interface, only recording the submit data in "form submission" dropdown.

This is unhelpful and not user-friendly for CMS user, developers, and infrastructure people. We cannot track/ debug/ get notice when form is submitting unsuccessful when Salesforce end shows data field mapping error.

There's no way every-time we have to login application insights, and search for request unsuccessful/ view live log stream. Please add the error notice, error message in form submission; The form submission only records what data website audience input, but it doesn't show are those data fields are really POST to Salesforce or not... This is not make sense....

This is a Nuget package in half-way finish, i can see in Marketing automative Salesforce connector code it do have error handling but no further steps to show the message in CMS interface.

And to give your team some example of what we are looking for showing up I also attached a form submission plugin i built myself. This is real-time track and can see payload, error message.