C6230: I bought a new 2021 phone; now I cannot connect to wifi network using my modem router

There is a chance your new phone will not handle the length or complexity of the password you have assigned to your home Wi-Fi.

For test purposes only, recommend you log in to your modem/router from a computer and web browser and establish a new simple Wi-Fi password and then check if you phone will connect.  If yes, you need to figure out what the length and complexity of password your new phone will accept.  If no, there may be a setting in your new phone that configures connection to your home Wi-Fi.  Does your friend where it does connect use a Netgear modem/router?