What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
We would appreciate if you could provide your custom domain which you used for your form. In addition to that, currently https:// is not supported, you need to use http://.
If you have any question or issues, please do not hesitate contacting us. We will be glad to assist you.
Seems that your custom domain is working but you forgot to add sufix number of your form on URL and when I added one of your form to this domain it is working:
Note - that after changing domains you need also to add sufix /form/IdOfYourForm
Hope this will help. Let us know if you need further assistance.