Access the Settings on your Samsung Galaxy S9 and look for the Wi-Fi option (it’s often located under the “Connections” tab within the device Settings).Tap Wi-Fi to open some extra settings and then look for the name of the Wi-Fi network that you are having trouble with.
I am sure that you will be able to resolve the connection issues with one of them.
If rebooting your network didn’t help, then try rebooting your Samsung Galaxy S9.
You shouldn’t need to press the reset button, just pull out the power cord from the router or modem, count to 15 secs, and then plug the power cable back in, wait a few minutes for the device to boot back up then try it again. Unplug the power cable count to 15 and plug it back in.
If it’s still connecting but not using the internet then power cycle the phone itself, turn it off and then turn it back on.
If you’re having Wi Fi problems on your Moto G smartphone, this could be due to either your smartphone being unable to connect, or your internet modem.
The Samsung Galaxy S9 may sometimes have problems and one of them is in the Wi-Fi connectivity of the device.So quadruple check the password one more time just for good measure and make sure that it is 100% correct in every way.I have seen however where the correct password and Wi-Fi information does not work and the device keeps displaying an Authentication failed error message.The first thing you ought to do is make sure that your Wi-Fi is working properly by connecting another device and verifying whether it’s the Samsung Galaxy S9 or your network that is causing the problem.If it turns out that it’s just your Samsung Galaxy S9 that won’t connect to the Wi-Fi, then go ahead with the following solutions for possible ways to help fix the problem.With this setting enabled you’re probably having more problems than just no Wi-Fi connection, but still check this setting on the phone and make sure that Airplane Mode is NOT on.