Unable to create Jira issue through code but able to create issue through Postman

[Shrikant Katagi]

I am trying to create an issue using service account in Jira via REST API call with code. When I run the code I am getting below error:

{\"summary\":\"Field 'summary' cannot be set. It is not on the appropriate screen, or unknown.\",\"description\":\"Field 'description' cannot be set. It is not on the appropriate screen, or unknown.\",\"components\":\"Field 'components' cannot be set. It is not on the appropriate screen, or unknown.\",\"customfield_11417\":\"Field 'customfield_11417' cannot be set. It is not on the appropriate screen, or unknown.\"}

Below is the code:

static async Task generateJiraTicket()
{
string jiraUrl = "https://<jira-server-url.com>/rest/api/2/issue/";
string username = "<email>";
string apiToken = "<generated_token>";

// Create JSON payload for the new issue
string issueData = @"
{
""fields"": {
 ""project"": { ""key"": ""<Key>"" },
 ""summary"": ""Test Jira Ticket for Forms"",
 ""description"": ""This is a sample Jira ticket created through code."",
 ""issuetype"": { ""name"": ""Bug"" },
 ""components"": [{""name"":""Test"",""value"":""Test value""}]
    },
    ""update"": {
        ""customfield_11417"": [
            {
                ""set"": {
                    ""value"": ""No, not required for Release Notes""
                }
            }
            ]
        } 
}";

using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri(jiraUrl);

client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", Convert.ToBase64String(Encoding.UTF8.GetBytes($"{username}:{apiToken}")));

try
{
// Send a POST request to create the issue

HttpResponseMessage response = await client.PostAsync(jiraUrl, new StringContent(issueData, Encoding.UTF8, "application/json"));

if (response.IsSuccessStatusCode)
{ 
string responseBody = await response.Content.ReadAsStringAsync();
Console.WriteLine("Issue created successfully!");
Console.WriteLine($"Ticket URL: {response.Headers.Location}");
Console.WriteLine($"Response content: {responseBody}");
}
else
{
Console.WriteLine($"Failed to create issue. Status code: {response.StatusCode}");
string errorResponse = await response.Content.ReadAsStringAsync();
Console.WriteLine($"Response content: {errorResponse}");
}
}catch (Exception ex)
{

Console.WriteLine($"Response content: {ex}");
}
}
}

With the same URL, Username, API Token and payload, I am able to create an issue in Postman. Can anyone help on this?