I can't play online!

I have the same issue. 
Did you already find a fix for this?

I have the same issue, any solution?

yeah. Restart your computer and try again.
When the game is connecting the first time, it opens a pop-up to sign in with your EA credentials.
For some reasons it didn't open for me and even after a game restart it did not open.

After PC reboot it opened, I entered my credentials and it worked.

Did you manage to fix it? I'm really stuck with the same issue and would appreciate any solution or advice.