Smart Campaigns: Trigger Fills Out Form - Incorrect or Missing Landing Page
Dear Marketo Support Team,
we're creating a Marketo Campaign for an upcoming webinar and we're having a problem with the trigger of a smart campaign "Fills Out Form".
When someone fills out a specified form on our WordPress website, his program status should be changed in the Flow.
This is our trigger in the smart campaign:

At first, I wasn't able to activate the campaign because Marketo said the Web Page is not valid.
After some minutes, I was able to activate the campaign but now it's not possible to register.
When I fill out the form on the WordPress site, the email does not appear in our database.
When clicking the preview button, this appears:

Could you please help me with this problem?
Best wishes,
Christina