I had this same issue last night night when I tried to log in. I had downloaded the beta version back in Feb. What I ended up doing was going to my notifications and I downloaded the game again except it wasn't called the beta version. You may have to go to the psn store first and redownload it first to get the open beta entitlement. Then you should be able to download it. Once I did that it updated the client and I was able to link my ps3 account.