Implementation RealTime TTS using websocket

[AAA0227]

using System;
using System.Collections.Concurrent;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using UnityEngine;

public class DeepgramRealtimeTTS : MonoBehaviour
{
[Header("Deepgram")]
public string apiKey;
public string model = "aura-2-thalia-en";
public int sampleRate = 48000;

[Header("Audio")]
public AudioSource audioSource;

private ClientWebSocket ws;
private ConcurrentQueue<float> audioQueue = new();
private AudioClip clip;

private const int CLIP_LENGTH_SECONDS = 10;
private int writePosition = 0;

async void Start()
{
    SetupAudio();
    await StartTTS("Hello, this is a text to speech example using Deepgram.one twoo three four five six seven eight nine ten");
}

void SetupAudio()
{
    clip = AudioClip.Create(
        "DeepgramStream",
        sampleRate * CLIP_LENGTH_SECONDS,
        1,
        sampleRate,
        true,
        OnAudioRead
    );

    audioSource.clip = clip;
    audioSource.loop = true;
    audioSource.Play();
}

async Task StartTTS(string text)
{
    ws = new ClientWebSocket();
    ws.Options.SetRequestHeader("Authorization", $"Token {apiKey}");

    string uri =
        $"wss://api.deepgram.com/v1/speak" +
        $"?model={model}" +
        $"&encoding=linear16" +
        $"&sample_rate={sampleRate}";

    await ws.ConnectAsync(new Uri(uri), CancellationToken.None);
    Debug.Log("Deepgram connected");

    _ = ReceiveAudio();

    string json = $"{{\"text\":\"{Escape(text)}\"}}";
    await ws.SendAsync(
        Encoding.UTF8.GetBytes(json),
        WebSocketMessageType.Text,
        true,
        CancellationToken.None
    );

    // Flush
    await ws.SendAsync(
        Encoding.UTF8.GetBytes("{\"type\":\"Flush\"}"),
        WebSocketMessageType.Text,
        true,
        CancellationToken.None
    );
}

async Task ReceiveAudio()
{
    byte[] buffer = new byte[8192];

    while (ws.State == WebSocketState.Open)
    {
        var result = await ws.ReceiveAsync(buffer, CancellationToken.None);
        print(result.MessageType);
        print(buffer);
        if (result.MessageType == WebSocketMessageType.Text)
        {
            ConvertPCMToFloat(buffer, result.Count);
        }
    }
}

void ConvertPCMToFloat(byte[] pcm, int length)
{
    for (int i = 0; i < length; i += 2)
    {
        short sample = (short)(pcm[i] | (pcm[i + 1] << 8));
        audioQueue.Enqueue(sample / 32768f);
    }
}

void OnAudioRead(float[] data)
{
    for (int i = 0; i < data.Length; i++)
    {
        if (audioQueue.TryDequeue(out float sample))
            data[i] = sample;
        else
            data[i] = 0f;
    }
}

string Escape(string s) =>
    s.Replace("\\", "\\\\").Replace("\"", "\\\"");

}

I have used this code for my work. but never play audio.
What is the issue in my code?

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