Used Maschine+ product registration failed

So I bought a used Maschine+ at Guitar Center. Came home, used the QR code reader on my phone to start the registration process. Midway through the process, the QR reader app crashes. This was between the product code being entered and me entering my own account information. So I go back through the process, and now the code comes up as invalid, telling me that the product is already registered! So is there some ghost account now with no information to which this Maschine+ is registered? I tried going to ni.de/register, and I get the same outcome. I am told the Maschine+ is registered to someone else. My QR code reader app, I suppose. I opened a support ticket. Literally just purchased this at Guitar Center less than two hours ago. What a bummer.