Here's what I got back from the dev team. Is there something basic we're missing? We've seen this behavior play out during testing. The issue is that third party cookies don’t work in mobile safari. So, if the first touch was set on a Marketo page and then they left and later came back and filled out a Marketo page form the cookie would parse into the form as normal. But first touch will not set or read on the pages where forms are embedded or are otherwise not hosted on Marketo. Basically that takes all traffic not on a marketo page coming through mobile safari out of the equation. We could do a few things to help capture some of those values, but ultimately anytime someone goes from a Wordpress page to a marketo page or vice versa, in safari mobile, the cookie is lost. We could set things up where anytime mobile safari is detected we set the hidden form values as something like “safari-mobile-no-cookie”, but as far as I can see in mobile safari we’re always going to have a dark spot as far as recording the cookie. Although to answer your initial question, they are on the same domain, unless that gets tricky when you bring wordpress into it. The blog is hosted on blog.DOMAIN.com and the Marketo pages are marketo.DOMAIN.com (well, not that, but you get the picture).
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