There may be several reasons:
1. Please check if the other devices could access internet through your router?
2. Maybe the network is disconnected in the configuration process, please try again.
3. Maybe the inputted password is wrong, please check the inputted password.
4. Please check the security configuration mode of your router, WPA/WPA2 is recommended.
5. Maybe the connection numbers of your router exceed maximum limit, please close the temporary unused equipment, and try again.