I'm also getting this, despite I've let both eso.exe and the launcher through the firewall (Bitdefender) and I can login into my account - but not into the game. My acc info says my trial period is active, so what else's wrong?
The Welcome Back Weekend event ended today at 10:00AM EDT. As such, folks that only have Trial access on their accounts will not be able to log in.
@ZOS_GaryA: I bought Elder Scrolls Online over Steam and am attempting to login with my old beta account. Is it possible to login with that account or do I need to make a new account for the Steam download?
At the moment, I am getting the "Your Login Information is Incorrect." after starting the game through Steam and logging in with my old account.
EDIT: I believe I found out how to fix this by logging into my account on the website and using the code that Steam gave me to upgrade my account from Trial. I will update this later if it does not work.
EDIT #2: This did fix the problem.