You mistyped the password (caps lock is on, or you confused 0 / O , 1 / l / I ).
Once connected, you will see a checkmark next to your network name. Look at the top of your phone’s screen—you should see the WiFi fan icon instead of the 4G/LTE icon. Set Up WiFi on NOKIA 6300 4G
Once Wi-Fi is active, all apps will prioritize it over mobile data (if the Wi-Fi connection is active and stable). You mistyped the password (caps lock is on,