[Nighthawk AC1900] Cannot connect to it in NAT mode

I started having problems with my connection, so I contacted the cable company and the site I was having problems with, and I need to check the modem to see if there might have been a change in my settings. I have an Orbi system as my router, so have the Nighthawk in NAT mode. I tried to go to http://192.168.0.1 to connect to it, but it won't connect- it times out. Is it possible that the IP address is different? Or is it because my Orbi mesh is 192.168.2.x? Just not sure why I can't connect to the modem.