With the IP address matching unless you can guess your old password I would export the forget password files for all of your cameras to Nikvision USA support and ask them very nicely for there help.
If you do export the files you must then stop all attempts to recover your cameras and leave both the NVR power up with cameras attached and the laptop as well with the SDAP tool active.
This is where I failed and rebooted the NVR a number of times which made the files they supplied back useless.
They also classed my WR cameras as grey because I purchase then online, but as a one of they did support them.
Once you have recovered the cameras I suggest you log in to each and answer three self password reset questions which they added with firmware v5.5.0. and also the same for the NVR if it’s firmware supports it.
If you do export the files you must then stop all attempts to recover your cameras and leave both the NVR power up with cameras attached and the laptop as well with the SDAP tool active.
This is where I failed and rebooted the NVR a number of times which made the files they supplied back useless.
They also classed my WR cameras as grey because I purchase then online, but as a one of they did support them.
Once you have recovered the cameras I suggest you log in to each and answer three self password reset questions which they added with firmware v5.5.0. and also the same for the NVR if it’s firmware supports it.