@Connie Lacognata Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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Personal voice is currently a preview
feature. Please note that the access was granted / approved for your subscription and not for the region.
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Note, personal voice is available in these regions: West Europe, East US, and South East Asia.
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So you need to first create the Speech Service resource in the above regions and then you will be able to use the Speech Studio and access the Personal Voice (preview) feature as shown below:
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The closest region for Australia is South East Asia. So until it is made available to Australia region, you can use this. Currently there is no ETA on when this feature would be made available to Australia region.
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Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.