How to apply PBR material to Procedurally generated Mesh?

I created a box using the code below, and I apply a PBR material to it, but it looks flat, which means the normal map doesn't affect its lighting at all. Here is an image for comparison. Left one is the box created using Unity Editor, right one is the procedural box. How do I fix it?

         MeshFilter filter = GetComponent<MeshFilter>();
         Mesh mesh = filter.mesh;
         mesh.Clear();
 
         float length = 1f;
         float width = 1f;
         float height = 1f;
 
         #region Vertices
         Vector3 p0 = new Vector3(-length * .5f, -width * .5f, height * .5f);
         Vector3 p1 = new Vector3(length * .5f, -width * .5f, height * .5f);
         Vector3 p2 = new Vector3(length * .5f, -width * .5f, -height * .5f);
         Vector3 p3 = new Vector3(-length * .5f, -width * .5f, -height * .5f);
 
         Vector3 p4 = new Vector3(-length * .5f, width * .5f, height * .5f);
         Vector3 p5 = new Vector3(length * .5f, width * .5f, height * .5f);
         Vector3 p6 = new Vector3(length * .5f, width * .5f, -height * .5f);
         Vector3 p7 = new Vector3(-length * .5f, width * .5f, -height * .5f);
 
         Vector3[] vertices = new Vector3[]
         {
     // Bottom
     p0, p1, p2, p3,
  
     // Left
     p7, p4, p0, p3,
  
     // Front
     p4, p5, p1, p0,
  
     // Back
     p6, p7, p3, p2,
  
     // Right
     p5, p6, p2, p1,
  
     // Top
     p7, p6, p5, p4
         };
         #endregion
 
         #region Normales
         Vector3 up = Vector3.up;
         Vector3 down = Vector3.down;
         Vector3 front = Vector3.forward;
         Vector3 back = Vector3.back;
         Vector3 left = Vector3.left;
         Vector3 right = Vector3.right;
 
         Vector3[] normales = new Vector3[]
         {
     // Bottom
     down, down, down, down,
  
     // Left
     left, left, left, left,
  
     // Front
     front, front, front, front,
  
     // Back
     back, back, back, back,
  
     // Right
     right, right, right, right,
  
     // Top
     up, up, up, up
         };
         #endregion
 
         #region UVs
         Vector2 _00 = new Vector2(0f, 0f);
         Vector2 _10 = new Vector2(1f, 0f);
         Vector2 _01 = new Vector2(0f, 1f);
         Vector2 _11 = new Vector2(1f, 1f);
 
         Vector2[] uvs = new Vector2[]
         {
     // Bottom
     _11, _01, _00, _10,
  
     // Left
     _11, _01, _00, _10,
  
     // Front
     _11, _01, _00, _10,
  
     // Back
     _11, _01, _00, _10,
  
     // Right
     _11, _01, _00, _10,
  
     // Top
     _11, _01, _00, _10,
         };
         #endregion
 
         #region Triangles
         int[] triangles = new int[]
         {
     // Bottom
     3, 1, 0,
     3, 2, 1,            
  
     // Left
     3 + 4 * 1, 1 + 4 * 1, 0 + 4 * 1,
     3 + 4 * 1, 2 + 4 * 1, 1 + 4 * 1,
  
     // Front
     3 + 4 * 2, 1 + 4 * 2, 0 + 4 * 2,
     3 + 4 * 2, 2 + 4 * 2, 1 + 4 * 2,
  
     // Back
     3 + 4 * 3, 1 + 4 * 3, 0 + 4 * 3,
     3 + 4 * 3, 2 + 4 * 3, 1 + 4 * 3,
  
     // Right
     3 + 4 * 4, 1 + 4 * 4, 0 + 4 * 4,
     3 + 4 * 4, 2 + 4 * 4, 1 + 4 * 4,
  
     // Top
     3 + 4 * 5, 1 + 4 * 5, 0 + 4 * 5,
     3 + 4 * 5, 2 + 4 * 5, 1 + 4 * 5,
 
         };
         #endregion
 
         mesh.vertices = vertices;
         mesh.normals = normales;
         mesh.uv = uvs;
         mesh.triangles = triangles;
         mesh.RecalculateNormals();
         mesh.RecalculateBounds();