I am using various tracking URLs for my multi-channel campaign in an effort to track source of new leads. In the form, I used a hidden field for field Lead Source that pulled the source info via referral URL, but that information is not being logged and Marketo has not provided a reason for this.
I see that Marketo records this information in a new lead's activity log via "query parameter", and I want to be able to see all of this information in a smart list. While I know I can track form fills by "querystring", I want to find a way to see all of this information for a specific set of leads.
You haven't provided enough detail about your setup.
Relying entirely on the the Referrer URL for tracking isn't possible, because sources can suppress part or all of the Referrer for security reasons and your form will never see the data, making it look like Direct traffic. You have to source-tag your links using query parameters.
Please provide more information and sample URLs or pages.
Check your Form settings and URL structure. Also make sure that field isn't blocked somehow.