Message "You are connected to an insecure WiFi Network"

Every time I start the MacBook I get the warning message "You are connected to an unsecured Wi-Fi network" from Norton, but the Norton software on my iPad on the same network gives no such warning message, indeed on the iPad Norton says that this network is password protected and is encrypted. I have recently changed from a EE WiFi Router to a Vodafone WiFi Router.

How can I avoid getting this message every time I start the Macbook ?

MacBook Pro with  macOS Big Sur 11.2.3

Vodafone VCNT-I Router with Software version 19.2.0307-3261019