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If the only field on the form is Email and that's already pre-filled, do they need to fill out a traditional form with fields on it? Marketo has a "Show Custom HTML Form for Known Leads" feature - would that work instead? Show Custom HTML Form for Known People - Marketo Docs - Product Documentation
Email isn't the only field on the form, unfortunately, it's just the only field that pops up when a known/munchkin'd user lands on the page. Net new users would see our full progression form. The problem comes from known users swapping out their existing email address for a net new one; the form doesn't recognize that the email address is new as it's IP address upon landing on the page was associated with another account. Crazy, I know.
Oh well! At least it's not a massive issue at this point.