@Lou505 

Don't use auto-fill, manually enter the password instead. Also, please watch out for characters that may have been typed unintentionally and are hard to spot, such as spaces or periods. 

Here’s a way to verify whether the Wi‑Fi password you’re using is correct: remove the saved Wi‑Fi profile from your phone and try reconnecting by entering the password again. If your phone can’t reconnect successfully, the password you remember may be incorrect. How to remove existing wireless network profile on Android&iPhone