The baked NavMesh also needs the Segments, which should form exactly the same shape as the baked NavMesh. The NavMesh alone isn't enough, if you're using Point And Click movement.
A drawback of the Unity's Navigation is that the "target" point must always be over a baked NavMesh. When the Hotspot is set to "Walk To", the target point becomes the Hotspot, where you have no NavMesh underneath. Therefore, only "Walk To Marker" (with a Marker positioned above a NavMesh) will guarantee a proper pathfind.
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A drawback of the Unity's Navigation is that the "target" point must always be over a baked NavMesh. When the Hotspot is set to "Walk To", the target point becomes the Hotspot, where you have no NavMesh underneath. Therefore, only "Walk To Marker" (with a Marker positioned above a NavMesh) will guarantee a proper pathfind.