Trouble logging in using wifi... Phone data works (title edited)

I have been having the same problem on two different devices. I have an S7 edge and Lenovo Yoga Tab 3. I can use the mobile data on the phone but the tab won't work at all (wifi only). I have Cox for isp. Every other thing on both machines works fine. I bought the tab for basically to play the game only and has all of it's storage space.