dahua ipc-hdw

Hi, I've an EZVIZ NVR (CS-X4-108P) which is POE only NVR with 8 channels. I've purchased a kit in 2019 which came with 4 cameras. Everything works well till now. But when I'm trying to connect Dahua camera to this NVR, it's not showing up in the monitor or mobile app. I've tried several...