Unless you have a special situation (such as living many hours from a test centre) you will not be able to sit an Online Proctored (OP) CPA Exam.
You will need to book a Test Centre for your CPA Exam.
You should contact CPA Member Services for help if you want to request an OP exam.
CPA Member Services contact details are here: https://www.cpaaustralia.com.au/member-services