Similar title: What to do when you can only view from LAN while not from WLAN?
Make sure you have connected the NVR to router by network cable and it shows Online on the NVR screen.
Right click and go to Fast Network and then click on Auto Config. After that, click on Test and check if the network is healthy.
Or you can click on manual config and tick DHCP and save.
You will see Network Status is connected when it is ok.
If the above does not solve your problem, please contact support with the above screen shots.