I try to send email via AWS SDK
I have accessKey and secretKey.

var accessKey = "";
var secretKey = "";
var region = RegionEndpoint.USEast1; // Use the appropriate region

var credentials = new Amazon.Runtime.BasicAWSCredentials(accessKey, secretKey);
var config = new AmazonSimpleEmailServiceConfig { RegionEndpoint = RegionEndpoint.USEast1 };


using var client = new AmazonSimpleEmailServiceClient(credentials, config);

var sendRequest = new SendEmailRequest
{
    Source = "[email protected]",
    Destination = new Destination
    {
        ToAddresses =
            new List<string> { "[email protected]" }
    },
    Message = new Message
    {
        Subject = new Content("Test email"),
        Body = new Body
        {
            Html = new Content
            {
                Charset = "UTF-8",
                Data = "<h1>Hello</h1><p>This is a test email sent using Amazon SES.</p>"
            },
            Text = new Content
            {
                Charset = "UTF-8",
                Data = "Hello, this is a test email sent using Amazon SES."
            }
        }
    }
};

try
{
    var response = await client.SendEmailAsync(sendRequest);
    Console.WriteLine("Email sent! Message ID: " + response.MessageId);
}
catch (Exception ex)
{
    Console.WriteLine("Error sending email: " + ex.Message);
}

But I got error message:

The security token included in the request is invalid.

Is it possible send email If I have only AccessKey and SecretKey ?
Or I have to generate token ?