The Wi-Fi authentication error occurred problem that you are experiencing on your Android device is usually caused by a wrong password or a network setting glitch.

A quick fix to Wi-Fi authentication problems on Android is to toggle airplane mode on and off, or "forget" the Wi-Fi network and reconnect to it.

How To Fix Samsung Galaxy A9 Authentication Error Occurred When Connecting To Hotspot Problem: HI, I have problem with my new samsung phone, samsung A9, it seems cannot connect with my PC hotspot.