I tried going back to the default IP address range.
Using SADP, I set the problem camera to 192.168.254.20, DHCP off
on NVR: Set internal NIC address as 192.168.254.1, Mask = 255.255.255.0
Attach problem camera to NVR POE port D14 and reboot NVR.
Then, on NVR:
Cameras > select D14>...