When I installed the app first time then sign in properly and working fine. Some days later when I want to change the sign in ID then the problem was started and still it's not working. Now the problem is the old sign in id also not working and when I try to sign in with new I'd then it's also not working. I cleaned all cache file from my phone, uninstalled the app many time but still the sign up problem is going on. As per your details contact help option is not working... Samsung just type..