I keep getting nonification updates the I need to Update Google Play services and that Google Play services wont run unless updated, wh I click on the nonification. It bring me to Googl play services but it says "Authentication is required. You need to sign into your google account which I checked in Accounts, I was signed in. I need to get the Play services to work as most of my apps like Snapchat rely on it.
Try to update Google settings, front-end for Google Play Store and other Google stuff. Go to Settings -> Apps -> Google Play Services and uninstall the updates. Leave the phone on WiFi. It will update automatically.