I am trying to set the status of a task as completed using Tasks API. It shows that the code has completed successfully, but the task is not being marked as completed. Also, when I try to get the status of the task after update, it shows status as "needsAction". Here is my code

function setTaskStatus(){
  // Suppose a task with name "MyTaskListName" is contained
  //within task list with name "MyTaskName"

  var tasklist = Tasks.Tasklists.list().getItems();
  var title = 'MyTaskListName';
  var id;
  for(var i in tasklist){
    if(title == tasklist[i].getTitle()){
      id = tasklist[i].getId();
    }
  }

  //Get the task list items
  var tasks = Tasks.Tasks.list(id).getItems();
  for(var i in tasks){
    if(tasks[i].getTitle() == 'MyTaskName'){
      tasks[i].setStatus("completed");// set status completed
      Logger.log(tasks[i].getStatus());// this shows that the task has completed
      //But it does not reflect actually
    }
  }
}