I have not been able to use My Optus App since upgrading my Huawei Mate 20 pro to EMUI 10 (Android 10).
When the app launches, the logo animation will play and it tries to open a new page and just crashes after.
I have tried to uninstall, reinstall, take out my sim, reinsert my sim, restarting my phone and nothing works. This has been ongoing since 2 months ago and it is getting rather frustrating.
Please go to the Play Store and leave feedback for My Optus app. The developers team should assist via there.
Let us know how you go.