If you are facing wifi authentication error in the android phone even after entering the right password then follow the below method.

1. Forget the Wifi network and try to reconnect it.
2. Restart the router and try connecting again.
3. Restart your android phone, sometimes this work.
4. Check whether your wifi has a user limit enabled?
5. Reset the router if the problem is still not solved. This will reset all router settings to the factory version and the authentication problem will be wiped out.
6. Try Using the WPS button to connect to wifi.

If the problem is still not solved then Read all 12 Working methods to fix wifi authentication error at the below post.

How to Fix WiFi Authentication Problem in Android | 2020 - Techorhow