Assistance with multi-section form

https://preview.webflow.com/preview/ohcov?preview=83790f9bf68a2c2c0d6b241f6bac5dc4

I’m attempting to build a multi-stage form… This is the latest iteration and is much tidier than previous versions… however the form doesn’t seem to be able to submit.

I’m unsure where I’ve gone wrong, any help appreciated! The form is on the ‘Tenancy Application’ page.