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3.2. Troubleshooting Network Connectivity

What if I know the password, but the network won’t accept it?

In iOS: Tap Settings > Wi-Fi >  > Forget this network. Then try to rejoin.

Still can’t connect? Reset your Network Settings:

Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before.

See more details here:   https://support.apple.com/en-ca/HT204051