Correct authentication, which works each time on the Optus My Account web site, is rejected by the Yes Optus app (Apple iOS 13.1.3).
I have gone through the password reset process several times to no avail. Also I uninstalled and reinstalled the app couple of times, incl. in to the local Optus store with a helpful service rep and a (maybe clueless) IT tech at the other end of the line.
This reported behaviour is the case, regardless whether I type in the password or have Apple Keychain auto populate the password field from a previous and stored attempt. I have also checked the password stored in iphone > Settings > web passwords. It is the correct.
The trial and error process is painful as the system locks out for 15 min repeatedly on multiple attempts (I assume 3) and the app is thus useless to me.
As a software developer myself, to me the behaviour smells like SAML interoperability issues and differences with different web services. But I am guessing only after many different UI tests.
Have other iOS 13.1.3 users experienced anything similar or is your App QoE fine?
You may need to contact Optus direct and see if they can't sort it out behind the scenes. Password snafus like you mention do happen occasionally but they usually just for specific individuals with corrupted accounts and not platform wide.
You can contact them via the Phone App.
Also working fine me, I'm on 13.1.3.
Options would be to contact Optus and/or try moving to 13.2.3 as Paddylee advises is available.
Okay thanks for trying that.
Next step from here would be as Peter suggested to contact Optus. I actually recommend leaving feedback for the My Optus app in iTunes directly for the developers, they are pretty good with responding.