Dear Kaylie,
Welcome to the Wefugees Community and thank you for reaching out to us.
Your spouse can apply for a family reunification visa at the German Embassy in Vienna. Their website is providing the respective information. I also found this leaflet explaining the documents you may have to submit for the visa application.
I hope this helps and please don't hesitate to get back to us with any further questions.
All the best,
Meike