RS 700. Do I really need a subsciption for it to work?

Hey FURRY. It's the latest Cox Cable High speed cable modem. I'm hooked up right now and online through my old LynkSys so I know it works. I could never get past the Nighthawk app attempting to connect to the 700. So I had little to no access to anything. After scanning the barcode on top it never even showed the network name written on the label. Maybe the power surge took out something? Not sure. I hope not though. Boocoo bucks for that thing.