My phone suddenly disconnected from my wifi

[Android Central Question]

My phone Samsung j6 2018 suddenly disconnected from my wifi and now can't reconnect to it but can to other networks. It said internet may not be available but other devices in the house remained connected and have no problem connecting. I reset network settings and even did a factory data reset but it says authentication error despite multiple password checks please help

 

[B. Diddy]

Welcome to Android Central! Try rebooting the router by unplugging its power for 30 seconds. If that doesn't help, then see if you can authenticate the phone while logged into some public open wi-fi network (like at your local library).