In your router settings, one of two things can be wrong. First, you might have "allow new devices to connect" toggled off. The second possibility is that you have blocked that specific IP address for your new TV. The best thing you can do is log into your router's settings and make sure it allows new connections for the network you're trying to connect to. Also, make sure that whatever band you're trying to connect to is supported by your TV's Wi-Fi card. For example, if your router is set to WPA3 security for that channel, you're going to need to switch it to WPA2 security to allow it to connect.
