Our 2018+ Nissan Leaf only shows about 125miles of range. But it looks like it has over 150 in the app. Nissan did an update to show a more accurate number. Can you update the app?
Range is heavily dependent on many factors, like the route, weather, topography, driving style...
What the car shows is just a value related to your past drives and will most likely never match an unknown route.
If you plan a route and that is totally impossible to drive, you can share it here and let us know the details. Then we can look into it.