Poll Displays But Does Not Advance

I created a PollUnit, whitelisted the appropriate domains, and copied and embedded the HTML into an HTML widget on an Elementor page. The first page of the poll displays. However, clicking the NEXT button has no effect. What am I missing?

Hi Tom,
can you send me the page where it is embedded? You can send it to philipp@pollunit.com, if you don't want to write it here in public.
Kind regards
Philipp