Both my Federal and NJ state tax returns were rejected for duplicate W2's. I went back into the W2 section and there was only on W2 for my wife and it was fine. After investigation, and looking through a bunch of TT stuff, it turns out that on the W2 in box 17 it had the state taxes that were taken out but it also had $45.83 of FLI. Because it was in box 17 that is where I entered it. After the investigation it states for NJ residencies if you have Family Leave Insurance in box 15-17 you'll need to remove it from those boxes and enter it into box 14. I looked at the state worksheet and it did have the salary for NJ in there twice as if it was a second state. I removed the FLI from box 17 and put it into box 14 and went back and checked the state worksheet and, yep, it removed the second state wages. Resubmitted both Federal and State returns and they were accepted.
Although I found the answer myself, buried in TT information, I believe that TT should either prompt you with a message stating that "it seems you have two states with the same wages is this correct?" or not tell you that the final review has no errors and go ahead and efile.
