Solved! Go to Solution.
Reviewing some of my older posts and thought I'd mention the approach we landed on here. We've moved on to the REST API and use associateLead to tie the user's munchkin cookie to the lead we're interested in. In most cases this seems to preserve their anonymous IP and inferred fields. I can't remember for sure if we ever got this to work with the SOAP API and syncLead.
Reviewing some of my older posts and thought I'd mention the approach we landed on here. We've moved on to the REST API and use associateLead to tie the user's munchkin cookie to the lead we're interested in. In most cases this seems to preserve their anonymous IP and inferred fields. I can't remember for sure if we ever got this to work with the SOAP API and syncLead.