Zillow Ownership Issue

[Brian Feltz]

I have a property under contract and I was creating a postlet and it keeps telling me there is a duplicate address in Zillow so it will not post there, the current owner said he released ownership in Zillow so I should be able to post it there as my own. How long does that take to before I am able to post it as my own, it has been 2 days! Am I missing a step I need to take to take ownership??