December 2015
I bought The Sims 4 twelve hours ago and the message "We're unable to connect to EA servers to activate The Sims 4 on this computer using your account." pops up with every attempted launch; whether as the admin, using offline mode, or just the regular boot I couldn't play the game. I had searched through many forums for a solution and all of them have failed.
These are the things I had tried:
I bought a game from a reliable supplier, Origin, and used my time with a rational expectation for it to work so it would be great if someone can give me a solution.
Thank you.
December 2015
Try contacting EA, not sure what causes this, might be something wrong with your account:
http://help.ea.com/en/contact-us/new/