Dear
@Zahra90,
thank you for your question in the community.
- you need to get married at the french authorities as the marriage certificate from the Embassy as the marriage by the laws of Afghanistan and not under German civil law.
- after getting married in france, you have to then appyl under austrialian immigration law for family unifiaction- in this case I suggest you get a lawyer in Australia.
I hope this addresses your question, if you need further assistance please do not hesitate to use the community.
Best regards,
Nilab