That's promising.
So - a suggestion:
With the camera on the router, access the camera web GUI and change its IP address to 10.1.1.100 and set the default gateway to 10.1.1.1 and subnet mask to 255.255.255.0
Let the camera reboot.
Don't worry that the browser will no longer connect to it.
Connect the camera to an NVR PoE port.
Access the NVR web GUI and do the 'Manual add' and set the target IP address to 10.1.1.100 with ONVIF and the known logonID/password.
When you had the camera working OK connected to the router, was the port in the NVR manual add set to 80?
You sir, are my hero!! It works LOL. Amazing. Now I need to try and do the same for my second camera!! What Ip address should i give the next one do you know?
Thanks again, you have saved me so much headache!!