BCFC: Please provide a link to the form page. If the form appears well as you say, and the problem is when people submit, it means that the thank you page can't be found.

The thank you page can be php or html, it has no importance with the new built in form processor. Probably a typing mistake in the form wizard.

Please provide a link, and post the URL of the Thank you page
I can't even find your website... At least not with the name you provided, which, in a Who Is search, results available(!).
Forms do NOT work in preview.

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