Your visitors visa does not permit you to work in australia.
If the work is in your home country and online as you would have been doing if you were not here then you have no issue.
But you cannot work and earn australian dollars.
If you do then you are in breach of the conditions and if discovered you will be deported.
So if you are doing your work that you do at home and can do it online you are ok./ Otherwise you have an issue and can be deported.
I hope this makes sense and is of assistance. if there is nothing further
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