Post form to another form not working?

Has anybody successfully done this?

I want to create a Mautic form (which will run on a landing page in Kiosk mode) so I can register new people for my site at in-person events.

I am using a Wordpress Plugin (called UsersWP) which creates custom registration forms.

I created the form in Mautic and matched the fields to the “name” of the field found on the registration form and all of the input types match.

The only field that is blank is the authorization header, which I am not sure why I would need…

Any idea what might be going wrong?