I linked the PS4 beta to my account to try it out and now I can no longer access the game on PC. It says: "This service account can not be used in the current environment. Use of an account on multiple platforms requires proper registration for each platform"
As far as I am aware I have registered everything properly. I wish I hadn't bothered now.
Works for me, i'm also online simultaniously on Ps4 and PC, i also registered on my existing account.
It's suddenly working now for some reason, very strange. Maybe it thought I was still logged into PS4 game, even though it was turned off.
It may have been trying to access your PS4 beta character when you hit Start which obviously is impossible to do on PC. Glad to hear it's working now. If it wasn't I would have told you to reselect your data center to ensure it wasn't erroneously pointing at the PS4 beta world's data center.