Leadbox Sending Error 2

Thank you Dave, Domain is working but when i try to fill form it gives error : Please try again. Sending error 2 - 2401:4900:1f32:796b:8855:ce75:fc4b:adc1
please check the attached screenshot and guide.

Before moving to live, Lead box was working. Can you please check and confirm here?

There are several console errors on the page. Please correct these errors.

Thank you Dave for your assistance. :)