Re: Online Split Screen Multiplayer GW2 for PS4

They should be signed in on their own profile.  Basic rundown:  Console needs PS plus account.  Both players need PS accounts and EA accounts tied to their console accounts.  Both players log in to PS accounts.  Player 1 starts game, goes to split screen menu and activates it.  Player two presses options button.  Game restarts and both are logged in.  It sounds like you're doing everything correctly.  If this sequence isn't working then it's something like the issues I described above.