I tried and tried to connect mine to wifi today and Nada. I purchased it via Amazon on 2-11-18.
-Samsung Galaxy S8
-Most up to date app and os
-2.4Ghz wifi network
-Linksys ea9300
-Password is letters and numbers (15 characters)
Network Name has spaces in it so i also created a guest network with no spaces and a very simple 8 character password. No luck still.
Tried using my phone as a mobile hotspot and connecting with my Samsung Galaxy Tab 4. Still nothing.
I tried all the steps above at least 3 times and no luck. My router has been rebooted several times as have my phone and tablet