Not able to install the Komoot App (or any apps)

I just bought a new Edge Explore 2, connected it to my iPhone, using the Garmin Connect and the Connect IQ apps and, as well, installed the Garmin Express app on my computer. I would like to install the Komoot app. I tried this directly on the device, via the Connect IW app and via Garmin Express/the Website, but either get a notification that I should update the Edge Explorer 2 (which I already did, version 27.13 is installed) or it seems to start the installation process, but nothing happens. 

Does anyone have the same problem or a solution?