Can't reply on tickets created using Form

[dprutean]

I am using Zammad 3.1.
If I create ticket using Web Form, the ticket has no reply button active, even if the user provided an email. What should be changed ?

<script id="zammad_form_script" src="https://support.dbschema.com/assets/form/form.js"></script>
                    <script>
$(function() {
  $('#feedback-form').ZammadForm({
    messageTitle: 'Support Issue',
    messageSubmit: 'Submit',
    messageThankYou: 'Thank you for your inquiry (#%s)! We\'ll contact you as soon as possible.',
    modal: true,
    attachmentSupport: true
  });
});
</script>```

[MrGeneration]

First things first: 3.1 is highly vunerable, please upgrade Zammad to 3.4.

Secondly, if your group hasn’t a mail adress configured, you won’t be able to send mails.