Audio AudioSource playing after game ends

Hi All,
I'm new to unity and currently struggling with some Audio issue. I've set a countdown time in my game which when reaches 10 seconds a "Tic-Tac" sound will start playing.

Code (CSharp):

1. private IEnumerator GameLoop()
2.     {
3.         yield return StartCoroutine(StartGame());
4.         yield return StartCoroutine(PlayGame());
5.         yield return StartCoroutine(EndGame());
6.  
7.         if (counter == 1 && elapsedTime >-1)
8.         {
9.             Time.timeScale = 0;
10.         }
11.         else if(elapsedTime < 0)
12.         {
13.             Time.timeScale = 0;
14.             restartButton.SetActive(true);
15.         }
16.  
17.         else
18.         {
19.             StartCoroutine(GameLoop());
20.         }
21.     }
22.  
23. private IEnumerator PlayGame()
24.     {
25.         EnableControl();
26.         messageText.text = string.Empty;
27.         while (counter < 1 )
28.         {
29.             if (elapsedTime < 11)
30.             {
31.                 StartCoroutine(TenSecondSound(1.0f));
32.              
33.             }
34.  
35.             if (elapsedTime < 0)
36.             {
37.                 break;
38.             }
39.             yield return null;
40.         }
41.     }
42.  
43. IEnumerator TenSecondSound(float t)
44.     {
45.  
46.        
47.         otherSounds.clip = ticTac;
48.         otherSounds.Play();
49.  
50.         Debug.Log("Playing " + elapsedTime);
51.  
52.         yield return new WaitForSeconds(t);
53.        
54.     }

The TenSecondSound executes the I can see the log message displayed, however the sound only plays when the loop ends.
I tried using otherSounds.PlayOneShot(tic_tok);
but the sound plays once and it's all cramped up I don't know why