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.
I have checked the email logs and found the invitation to create an account in order to view shared forms, I can see the email is indeed in our bounce list, but the emails with the invitation have been sent already.
I have already removed it from our bounce list so you can receive emails from JotForm now. Also, your sub-user could create an account using the email address where you shared the forms, he should find the shared folder already when log in.