TU App currently not installable via Google Play (solved)

Alternatively, the web app version of the app can be used.
This can be accessed via the address: https://app.itmc.tu-dortmund.de/ and then installed on the device.
Further information can be found at: https: //service.tu-dortmund.de/app.
Update: The problem has been fixed, the app can be installed again via the App Store.