Referral UTM not tracking?
I have a form set up with a hidden field to capture the utm_campaign on the referral link and write it to the Person Source. If its not present, it defaults to Gated Content. Here's how I have it set up:

I'm trying to test it with some ads we're running. The ads point to this URL: https://www.plasticsurgery.org/cosmetic-procedures/liposuction?utm_source=Dynadmic&utm_medium=Video-Advertising&utm_campaign=Dynadmic-Liposuction-Q4-2021
On that page, there's a CTA that leads to a Marketo landing page at https://pages.plasticsurgery.org/LiposuctionHandbook.html
I've been trying to test it by pasting the link above into an Incognito browser, clicking on the CTA, then creating a fake account. But when I check the program member record of the fake account, it shows the Person Source set to the default, Gated Content.
I had this set up and let it run for a few days, and I did catch the UTM parameter of a completely different campaign in the list (this is the only thing currently running that sets Person Source.) So the field is capturing something, just not when I do it.
Do I need to set this up differently, or is this just something that isn't going to be captured (or maybe it is - but no one from the ads is filling out the forms)?