Form submission will not go through

Thank you! I have a potential client that has tried to fill out my form
three times in the last day or so but it will not go through. Are you able
to help me troubleshoot this?
...

We would love to help. Could you please let us know if the form is used by its direct link or an embedded version? If this is an embedded form, please provide us with a link where we can reproduce the issue. Also, let us know if the client is getting any specific errors.