@Christian-Siegel
You are not doing anything wrong, the dotted line shows an unpaved road, which is why the chosen map (OSM, TomTom or the Here map) cannot draw a route.
You can try another map or choose skip route point for point 8
Map Choice:
3dce97c5-aa38-4a71-93c8-b1029d6657b5-image.png
Skip route point:
2f22ad0e-2fc3-424a-8f51-76fb30329383-image.png