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What to try when GreenRah cannot build a path between From and To.
Check that both From and To are set and not on top of each other.
Very long walks can fail if the trip date is outside what your account allows. Sign in for a longer planning window.
If one point is in water, a park with no paths, or far from walkable streets, move the pin slightly onto a street.
Try the other mode (Heat Smart or Accessible). Sometimes one goal finds a path when the other does not.
Still stuck? Zoom out to confirm both points are in an area GreenRah covers (Lisbon focus today).