Wifi password says incorrect but its not

During the setup process, you may run into an error telling you that your Wi-Fi password is incorrect. If you believe this to be an error, try the following: Verify that your password is not case-sensitive. If you have a simultaneous dual-band router, separate the 2.4 GHz and 5 GHz networks (Original Canary only)

The iPhone saying incorrect Wi-Fi password issue might be because of any glitch in the Wi-Fi router or modem. Restarting the modem or router might do the best. Turn off the power supply to the modem/router and restart the device after turning on the power supply.