Hidden attribution fields at submit time

What to fix

Populate hidden UTM / click-ID fields before submit using HandL UTM Grabber or equivalent first-party capture.

Step-by-step fix

1. Install and activate HandL UTM Grabber (or your chosen attribution plugin) and confirm it is not disabled for the form page.
2. In the form plugin, add hidden fields whose names match the Grabber field list (utm_source, utm_medium, utm_campaign, utm_content, utm_term, gclid, fbclid, etc.).
3. Map each hidden field to the Grabber shortcode or autofill source documented for that plugin.
4. Submit a test lead with ?utm_source=test in the URL and inspect the entry — hidden fields must be non-empty.

Choose the path for your setup

• Gravity Forms

  Hidden fields → default value from Grabber merge tags / dynamic population as documented for your Grabber version.

• Elementor Form

  Add hidden fields and set default values from the Grabber’s supported dynamic tags.

Confirm it is fixed

Re-scan with UTMs on the landing URL and confirm B12 sees hidden attribution fields populated at submit time.