Based on the documentation, I see two issues:

Problem 1: For AJAX submissions, you need to use /ajax/ in the URL path.

Problem 2: The _autoresponse feature doesn't work with AJAX forms.

Let me fix the form:

I fixed two issues based on the FormSubmit documentation:

1. Changed to AJAX endpoint - The URL now uses https://formsubmit.co/ajax/your@email.com which is required for AJAX submissions to work properly
2. Removed _autoresponse - The docs state autoresponse doesn't work with AJAX forms, so I removed it
3. Disabled captcha - Set _captcha to false since the reCAPTCHA can interfere with AJAX submissions

To test: Submit the form now and you should receive the email. The first submission will trigger a confirmation email to sltcvs24@gmail.com - click the activation link in that email to start receiving all future submissions.