efcore.pg: Unable to create sequence column in postgresql using migration

Hi, I have created the attached migrations as below

migrationBuilder.CreateTable(
    name: "ToDoItems",
    columns: table => new
    {
        Id = table.Column<int>(nullable: false),
        Name = table.Column<string>(nullable: true)
    }
    , constraints: table =>
    {
        table.PrimaryKey("PK_ToDoItems", x => x.Id);

    }
);

protected override void BuildTargetModel(ModelBuilder modelBuilder)
{
    modelBuilder.Entity("DataAccessLayer.Model.ToDoItem", b =>
    {
        b.Property<int>("Id").**ValueGeneratedOnAdd();**
        b.Property<string>("Name");
        b.HasKey("Id");
        b.ToTable("ToDoItems");
    });
}

It can bee seen that we have added ValueGeneratedOnAdd. But during the insertion the integer sequence is not getting generated and since ID is primary key the insertion is failing.

Point to note it is new database.

Any help/suggestion in this regard will be of immense help.

Thanks and regards Venkatesh Srini