The WAN gateway needs to be set the IP the ISP gave you so pfSense knows where to route traffic.
That gateway may not respond to pings which is what pfSense uses to monitor the status. You can set different IP for it to check against, like 8.8.8.8 in System > Routing > Gateways: Edit the WAN gateway.
You might also need to reboot any sort of ONT or modem the ISP provided if you connected to it with your laptop and it locked to the MAC address of that.
Steve