Why no auto-response emails get sent?

You might just simply forgot to trun on "Is form sender's Email" option of Email field.

To enable auto-response email, here are the steps:

1. Make sure the "Is form sender's Email" is checked
2. On Settins > Auto-Response Email section, makre sure you enter Subject, and define Template message. No auto-response emails will be sent if they're empty.
3. Test your form

Mark form sender option

Define auto-response email Subject and Template message