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If you have another phone or computer or any device that can see Wi-Fi connections make sure that the other devices can see and connect to it.
It tries to verify/authenticate the password that you are using to log into your router/network and if the password is wrong then it fails to authenticate and will show an Authentication failed error message.
Simply unplug the power cable from your router/modem wait 30 seconds to a minute and then plug the power cord back into the router/modem.
It may take a few minutes for the network to start-up again so give it 2-5 minutes to make sure everything was able to boot up as it’s supposed to and then check your Samsung Galaxy S7 to see if the internet is working or not. If not, then you might want to check out some more troubleshooting tips below.
Following the first step in this article and triple checking the password can usually help to resolve authentication failed errors and allow you to get back on track and connected to your network once again.
So quadruple check the password one more time just for good measure and make sure that it is 100% correct in every way.