Same issue. Still not working. Anyone have a solution???
I went to watch some sport last night and found my app was logged out (never happened before). I tried to login and it wouldn't work so I tried to reset my password and the link did not take me to a reset page, it just kicked me back into the app without me being able to login... very frustrating. The live chat guys reset my password for me but I still cannot log into Sport - it just says unsername or assword is invalid. I know the details are correct as they get me into the all other areas of optus e.g my account. The live chat guys were unable to help an told me to call the sport number but noone answers it...
Thanks to this issue I missed the biggest game of the year Man U Man City - thanks Optus.
Have you tried logging into Optus Sport via a web browser? If that works it may be the app playing up and uninstalling it and reinstalling it may help.