EditorSceneManager.sceneLoaded isn't working

I can't get sceneLoaded delegates to work. The code below does not work when scenes are loaded either in Edit mode or in Play mode. Is this a bug or am I missing the correct format?

Code (CSharp):

1.  
2. using UnityEngine;
3. using UnityEditor;
4. using UnityEditor.SceneManagement;
5. using UnityEngine.SceneManagement;
6.  
7. [InitializeOnLoad]
8. public class AddManagerScene {
9.     static AddManagerScene() {
10.         EditorSceneManager.sceneLoaded += OnSceneLoaded;
11.         SceneManager.sceneLoaded += OnSceneLoaded;
12.     }
13.  
14.     static void OnSceneLoaded(Scene scene, LoadSceneMode loadSceneMode) {
15.         Debug.Log("OnSceneLoaded");
16.     }
17. }
18.  

 

Thank you, Mads.