405 Error on Form Submission

Hi, I’m working on a site that has a registration form that pushes the data to Pardot via POST. On submission, I’m getting a “405 Not Allowed (openresty)” error. What is strange is that the data is showing up in Pardot, so the connection is made, meaning the error is coming from the Webflow side.

Has anyone else encountered this issue? Any thoughts on what might be causing the error?
On prior registration sites we’ve built (Wordpress), this wasn’t an issue and the connection worked without the error.

Read-only Link:
https://preview.webflow.com/preview/bmo-etfs-fall-roadshow-2022?utm_medium=preview_link&utm_source=designer&utm_content=bmo-etfs-fall-roadshow-2022&preview=6c7ea6bf074c855d7fa3299c5bbccebb&pageId=62f406fc33f5452e233cdb05&workflow=preview

Thanks in advance for any help or feedback.