Vertex coloring isn't working

So, I'm making a custom mesh directly from scripting, setting up the vertices, triangles, normals and UVs, and now also trying to change the vertices colors (Vertex colors).

However, even tho I don't have any errors when I run the script, no results shows up. The mesh aren't colored or anything, but the colors ARE getting actually getting inserted to the mesh.

This is my code:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 public class RoomCreator : MonoBehaviour {
 
     private List<Vector3> Mesh_Vertices = new List<Vector3>();
     private List<Vector2> Mesh_Uvs = new List<Vector2>();
     private List<int> Mesh_Triangles = new List<int>();
 
     private MeshFilter meshFilter;
 
     void Start() {
         meshFilter = GetComponent<MeshFilter>();
 
         CreateRoom();
     }
 
     private void CreateRoom() {
         meshFilter.mesh = CreateMesh();
     }
 
     private Mesh CreateMesh() {
         Mesh m = new Mesh();
         m.name = gameObject.name + "_Mesh";
         
         CreateFace(new Vector3(0,0,0), 10,1,0);
         CreateFace(new Vector3(10,0,0), 0,1,10);
 
         m.vertices = Mesh_Vertices.ToArray();
         m.triangles = Mesh_Triangles.ToArray();
         m.uv = Mesh_Uvs.ToArray();
         m.RecalculateNormals();
 
         print("Vertices: " + Mesh_Vertices.Count); // Vertices: 8
         print("Triangles: " + Mesh_Triangles.Count); // Triangles: 12
 
         Color[] colors = ColorizeFaces(m.vertices, m.triangles);
         m.colors = colors;
 
         print("Colors: " + m.colors.Length); // Colors: 8
 
         return m;
     }
     
     private Color[] ColorizeFaces(Vector3[] vertices, int[] triangles) {
         Color[] colors = new Color[vertices.Length];
         Color triColor = getRandomColor();
 
         for (int i = 0; i < triangles.Length; i++)
         {
             int vertIndex = triangles[i];
             if (i % 3 == 0)
                 triColor = getRandomColor();
             colors[vertIndex] = triColor;
         }
 
         return colors;
     }
 
     private Color getRandomColor()
     {
         float red = Random.Range(0.0f, 1.0f);
         float green = Random.Range(0.0f, 1.0f);
         float blue = Random.Range(0.0f, 1.0f);
         return new Color(red, green, blue);
     }
     
     private void CreateFace(Vector3 position,int width, int height, int depth) {
         Mesh_Vertices.Add(new Vector3(position.x, position.y, position.z));
         Mesh_Vertices.Add(new Vector3(position.x+width, position.y, position.z+depth));
         Mesh_Vertices.Add(new Vector3(position.x, position.y+height, position.z));
         Mesh_Vertices.Add(new Vector3(position.x+width, position.y+height, position.z+depth));
 
         int a = Mesh_Vertices.Count-1;
         int b = a-1;
         int c = a-2;
         int d = a-3;
 
         Mesh_Triangles.Add(a);
         Mesh_Triangles.Add(b);
         Mesh_Triangles.Add(d);
 
         Mesh_Triangles.Add(d);
         Mesh_Triangles.Add(c);
         Mesh_Triangles.Add(a);
 
         Mesh_Uvs.Add(new Vector2(0,0));
         Mesh_Uvs.Add(new Vector2(1,0));
         Mesh_Uvs.Add(new Vector2(0,1));
         Mesh_Uvs.Add(new Vector2(1,1));
     }
 }