Hello,
Our support does not cover fixing errors related to the plugins. Our support covers only issues related to our theme.
At the same time, based on my experience I can say that the error can be caused either by the wrong configuration of the form or lack of configuration on the server. In order to find out the reason, create a default form in Contact form plugin, add its shortcode to any testing page, and try to send an email. If it is sent ok, it means you should check the form. Server works. If it is not sent, contact your host support.
The form may have a lot of errors, however, the most common one is this: https://prnt.sc/tl8s3j
Best Regards