New Box not connecting to X1

Hello. The cable box in my bedroom recently threw up an error about the memory card not working and I couldn’t rewind or pause live tv so I ordered a replacement.

Today, the new box came (RNG 150N) and it fired up ok, but it will not connect to X1. I can watch TV with the new box, but I can’t access anything my DVR or anything because that’s all X1 related. All the connections are tight, rebooted the main box and the new box several times, still nothing. I just swapped back to the old box for the time being because at least I can still access my DVR on it, because the X1 still connects fine. Any clue what might be the problem? Defective box, perhaps?