I have a form that used the html code from a Marketo form, but was used on an external landing page outside of Marketo. It seems that Marketo is not reading this form, even though it is from a template in Marketo.
Did you use the HTML - generated code from forms 2.0, or through another method? Copy-pasting code from another landing page might not work outright. If you have an example via link it might be helpful to see so I can assist you.