Help!

The NVR is not detecting the cameras. The initial setup had the cameras going to switch then to a nvr. The system (which is probably at least 5 years old) quit working. So I purchased an NVR with PoE in hopes of eliminating the switch. But, the NVR does not detect the cameras. I have no information on the original setup. Was using Sibell Mobile app to view cameras. I have a total of 8 cameras with intentions of adding a few more soon, thus the 16 channel.

and I usually don't struggle with tech.

Current Camera:

IP CAMERA 

Model: IPOD-SB2IRE28

System: NTSC

Power: DC 12V/POE

ONVIFI

S/N EDE13718051452