There are connections between German and Austrian Islamists. However, these are individual cases rather than transnational network structures. This is the result of an answer by the Federal Government to a parliamentary question by the parliamentary group Die Linke.
The reason for the parliamentary question was the investigation of a suspected cell of the terrorist militia “Islamic State” (IS) in Austria by local security authorities. The group is said to have worked on attacks at major events in Europe. According to the Federal Government, the Austrian organisation “IMAN” is of transnational importance for the German Salafist scene. Several persons from the Islamist spectrum living in Germany were involved with this group as well as with “IMAN TV”.
The German and Austrian offshoots of the “Muslim Brotherhood” – “Deutsche Muslimische Gemeinschaft e. V.” in Germany and “Liga Kultur” in Austria – are influenced by the European umbrella organisation “Council of European Muslims” (CEM). The Muslim Brotherhood refers to the umbrella organisation as its “European wing”. German and Austrian representatives of the Muslim Brotherhood are also networked through the CEM. Hizb ut-Tahrir”, which has been banned from operating in Germany since 2003, considers the German-speaking region – Germany, Austria and Switzerland – as a coherent area (“Wilayah”).
https://www.idea.de/artikel/zwischen-deutschen-und-oesterreichischen-islamisten-besteht-kontakt