eBay

So I had this buyer buy a new laptop from me, turns out it was a scam account and is no longer registered on eBay. Now I wanted to relist it, however when I pressed that action it took me to the page and there was an error, "Page not found." I tried ...

I recently bought a smartphone and forgot to buy the warranty with it ($20). If I were to buy the warranty would it still work even though I already have the phone? Thanks