AzureOpenAI deployment Issue

I am creating a small POC where i am trying to get the response from LLM using gpt-4.1 model Please Note i am using SDK here, i am able to get the response if i create plain REST API.

Below is my code:

appSettings.json:

{
    "AzureOpenAI": {
      "Endpoint": "https://srch-nvi-genwizard-devres.openai.azure.com/",
      "ApiKey": "MyAPIKey",
      "Deployment": "gpt-4.1"
  },
}

Program.cs -> Just the configuration part

using Azure;
using Azure.AI.Inference;
using Azure.Core.Diagnostics;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddSingleton(sp =>
{
    var config = sp.GetRequiredService<IConfiguration>();

    return new ChatCompletionsClient(
        new Uri(config["AzureOpenAI:Endpoint"]),
        new AzureKeyCredential(config["AzureOpenAI:ApiKey"])
    );
});

Controller (I am pasting an image, since there's some issue updating more code: Hotelcontroller.cs

When i run this i am getting 404 error : Request not found

While if i use the same configuration in Python, i am able to get the response

FYI: Endpoint URL, APIKey and Deployment name is correct here.