How to run an ECS task from AWS Lambda function?

Question

I have created an ECS task definition and that runs successfully using AWS console and AWS CLI. Multiple instances of these tasks would run in a cluster. These are long-running tasks (few months to years).

I'm trying to run an instance of this task using the AWS Lambda function but it's not working. No error is thrown and a task does not run. I have added AdministratorAccess to the execution role used by the lambda. The VPC, subnet group, and security groups are configured in Lambda (tab Configuration > VPC)

Goal is to run the task and not wait for response (as these are long running tasks):

var aws = require('aws-sdk');
var ecs = new aws.ECS();

exports.handler = async (event) => {
     
   var params = {
        cluster: "default", 
        count: 1,
       launchType: "FARGATE",
       networkConfiguration: { 
         awsvpcConfiguration: { 
         assignPublicIp: "ENABLED",
         securityGroups: [ "sg-79002b" ],
         subnets: [ "subnet-f4b4bf" ]
        }
       },
    taskDefinition: "ecs-test-job-TestTaskDefinition-RgKHGrRzWZOq:1"
 };
 ecs.runTask(params, function(err) {
      if (err) { console.warn('error: ', "Error while starting task: " + err); }
 });
};

Response:

Function Logs
START RequestId: 3f89e3d7-b997-4cda-a939-1ad806812c31 Version: $LATEST
END RequestId: 3f89e3d7-b997-4cda-a939-1ad806812c31
REPORT RequestId: 3f89e3d7-b997-4cda-a939-1ad806812c31  Duration: 50.20 ms  Billed Duration: 51 ms  Memory Size: 1280 MB    Max Memory Used: 87 MB  Init Duration: 417.57 ms