So me and my brother were trying to get DLC from LBP2 extras edition onto PS4 LBP3. When we logged onto his account and started the game it said it recognized him from LBP2, and to go to my unlocks to transfer the data across. It worked fine for him, he got all the DLCs and stuff. So we switched over to transfer the DLCs to my account. At first it didn't recognize me because I actually hadn't been on LBP2 with my account yet. I quickly started it up and got as far as the pod, and then quit. Once I was back on the PS4 it said that it recognised me from LBP2 and to go to 'my unlocks' again. But when I did, everything was crossed out and I couldn't transfer over any data.
Is there a reason for this? Any help appreciated 

You have to play the story to get the pins, but you dont have to collect all the prizebubbles or play the minigames... the game will see the "you completed avalonia" pin and will give you all the prizes of that part of LBP2... and of course, this is just for story mode, not for (shared) DLC...

So I have to complete the story in LBP2? Or do I just have to complete the story in any one of the games? Because my brother has beaten 1 and 3 but done hardly anything on 2 and is able to transfer.