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As an Australian visiting Germany you are allowed to engage in business activities (but not work in local employment) in Germany when entering on the short-term Schengen visa waiver program.
You must conform the the other requirements of the program which include:
The European Travel Information and Authorisation System (ETIAS) program may change the process from 2022.
References
https://www.auswaertiges-amt.de/en/einreiseundaufenthalt/visabestimmungen-node https://www.auswaertiges-amt.de/en/einreiseundaufenthalt/-/231148 https://www.schengenvisainfo.com/etias/ https://eeas.europa.eu/sites/eeas/files/visa_waiver_faqs_en.pdf