register problem

RoZeLL

hello everyone,

I bought a second hand Traktor S4 MK3 in like new condition from someone serious who didn't used it a lot. when I wanted to register the equipment on my NI account (I already had an NI account because before taking the s4 I had a s2 well registered and therefore the software) with the serial number, I got a message saying that this device was already registered on another account. I then saw that a license transfer was necessary, which I requested from the seller. when he looked on his NI account, the device does not appear and he tells me that he had not registered it. so he can't make the transfer to me. what can I do?

thank you for helping me, waiting for your answers.