Bryant,
Sounds like you might have to ask Zendesk on tracking code issues.
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Is your support portal visible to the outside world?
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has anyone filled out a form on the Support portal?
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are you getting anonymous support portal traffic showing up in Marketo?
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which type of code did you use?
the thing to remember here, is if you are attempting to track on more than 1 domain, you won't get a sync of the lead data until the lead fills out forms on BOTH sites.