Where can I get .au domain

I have been trying to buy .au domain but they keep asking for verification
Does anyone know where I can buy without the ABN

You probably can't since it's required from the ICANN and not just within the registrars requirements,
Not legally at least, probably gonna need some bh service for that,

Another way is to get an TLD in AU or get someone to register the domain for you,
You can try the HAF section for that