Originally Posted by fakelogic

I also had a checkout Sunday 9/15 and am seeing the "signIn.error-SystemError" message when attempting to login. The app was partially functioning (could see reservations, but not able to retrieve any updated account details like points balance, etc), but once the Hyatt agent reset my password over the phone, the Hyatt app got logged out and now I'm unable to log back in to that at all.