JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I did check your form and I am unable to replicate the issue you are having. Vimeo widget does works as expected in your form. Please check the screenshot below:
Have you embedded your form in any webpage where the widget is not working? Please share the webpage URL and we will take a look.
We will wait for your response.