Welcome to the Wefugees Community and thank you for reaching out to us.
Sorry for the rather late reply. The platform and our experts are based in Germany and I am unfortunately also not too familiar with Austrian immigration laws and procedures. I assume that you need to fulfil certain requirements to get a family reunification visa and a residence permit for your spouse. I recommend you to contact a local migration counselling office to discuss the details. The Caritas is offering those kind of services (free of charge and confidential), for instance. I found this website which includes a search engine for offices in the whole country.
I hope this helps and please don't hesitate to get back to us with any further questions.
All the best,