Ralf Rangnick's Austria stumbled in Vienna as they failed to follow his impressive start to international management in a 2-1 loss to Denmark.
The kick-off was delayed by 90 minutes due to a power outtage in the city that saw fans using their phones to try and light the stadium.
Tottenham midfielder Pierre-Emille Hojberg opened the scoring against the run of play after half an hour. It was Denmark's first chance of the game and their only meaningful attack for 15 minutes.
Austria looked rattled for the rest of the first half but were much stronger after the break thanks to the introduction of Marko Arnautovic.