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That's weird it I'm on it at the moment and it seems to be working as expected for me on mobile.
Can you access this page https://www.ato.gov.au/General/online-services/technical-support/troubleshooting-for-individuals/
There are no known issues at the moment with our services. We recommend checking that you have a stable internet connection, you can also try to open our site using a different browser (for example FireFox).
All the best