Push Notifications Disabled (error 400)

Question

I'm getting this error whenever I open my ESPN Streak for the Cash app. I've contacted ESPNs customer care and they are saying my error is an itunes/iphone issue.
The problem:
I purchased a separate service within the app to send me additional push notifications. When asked to enter my itunes password to confirm i did. This was actually the second account I tried doing this from and it worked on the first. I've heard that you should have separate itunes accounts for each iphone. I dont know if that was the issue or not, but I did create another itunes account and deleted the app and redownloaded and purchased the push notification service. I still get the error 400, but at least it says my subscription is pending now whereas it didn't register before, but still no pushes. I've also noticed for some of my other apps that i dont receive push notifications anymore. Chess with friends, facebook, email. It only bothers me because i'm paying an additional subscription service for the espn app and i cant receive push notificaitons.
the actual message reads: Push notifications are disabled or failed to initialize. (error 400: contact customer care)
I am also prompted to enter my itunes password everytime i open the app. I've also received (error 100: contact customer care)before. Don't know if any of this could be useful info. But that's pretty much all i know.

Answer 1

I don't know where your other reply went re: turning off push notifications and that this appears to be a problem for 4s users. 
Anyway, thanks for the reboot suggestion, tried that as well.  I will try to turn off push notifications and then turn back on to see if that makes a difference.