Zoom Voice calling -Make voice call in C# Visual Studio

I am developing a tool in C# to make Zoom voice calls, I can authenticate and get the call-back access token. At the same time code below to make a voice call getting the error 404. Any solutions/suggestions? I appreciate any help you can provide.
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(“Bearer”, accessToken);
var callData = new
from = userId,
to = phoneNumber,
content = “make_call”
var content = new StringContent(JsonConvert.SerializeObject(callData), System.Text.Encoding.UTF8, “application/json”);
var response1 = await httpClient.PostAsJsonAsync(“v2/phone/call”, content);

Hi @venkat65534
Thanks for reaching out to us and welcome to our Zoom Developer forum!
Could you please share with me the endpoint you are trying to access with your code?