It requires the existence of a valid residence permit or confirmation. Last of All The au-pair agent can answer further questions. The agent will stand by the au-pair during the stay in case of possible difficulties. For this there must exist serious reasons. Make an earnest and worthwhile effort to improve your knowledge of German and resolve to have a vlauable life experience from the many fresh and different impressions, which are sometimes difficult but also fine.
Nothing then can stand in the way of a successful stay in Germany. .