I am creating a Landing Page with the Acquisitiion form.
I saw that there is a Confirmation Page and an Error Page (404).
In which case the 404 will appear to a recipient?
In the guide are is nothing about it.
Error 404 is not "Not found".
Check the location and access authorization.
One scenario the error page get triggered is when you want to Insert a record to ACS via landing page for a reconciliation key defined in Landing page which already exists and the update strategy you selected is Unauthorized.