Ed,
With Hikvision NVRs that have built-in PoE, they can be finicky and not like having a camera put in with an IP that was not the assigned IP of that specific port. It is best to assign the camera to the specific listed IP for that port, the gateway will be the gateway of the PoE on the NVR and should be listed in the NVR. Ensure that ONVIF is enabled in that IC camera, make sure to manually add the camera to the NVR putting in the proper admin password. I have gotten many of thrid party cameras to work on Hikvision built-in PoE units, sometimes I feel there is a little voodoo magic, it seems, involved when it actually works, so it may take a few different attempts.
I have also, got it to work by setting the cameras IP to match, using Plug and Play option and adjusting the password. So, like I stated it can be funny with what actually it takes to get it to work.