Use this slution in Editor : https://answers.unity.com/questions/737002/wav-byte-to-audioclip.html

No problem in build so here the code i use :

```
public class AudioRequest
{
public AudioClip audioClip = null;

public IEnumerator SendGetAudio(string url)
{
//Due to bug in Editor MP3 not supported

using (UnityWebRequest www = UnityWebRequestMultimedia.GetAudioClip(url, AudioType.MPEG))
{
yield return www.SendWebRequest();

if (www.isNetworkError || www.isHttpError)
{
throw new Exception(www.error + "\n>>" + url);
}
else
{
#if UNITY_EDITOR
audioClip = NAudioPlayer.FromMp3Data(www.downloadHandler.data);
#else
audioClip = DownloadHandlerAudioClip.GetContent(www);
#endif
}
}
}
}
```