Unable to assume role and validate the specified targetGroupArn

Terraform Providers AWS
1

Hi,

I have this error where i want to create a aws_ecs_service

resource "aws_ecs_service" "bffMobileService" {
  name            = "bffMobileService"
  cluster         = aws_ecs_cluster.bffMobileClusterDev.id
  task_definition = aws_ecs_task_definition.bffMobileService.arn
  desired_count   = 1
  iam_role        = aws_iam_role.ecs_task_role.arn
  depends_on      = [aws_iam_role.ecs_task_execution_role]

  ordered_placement_strategy {
    type  = "binpack"
    field = "cpu"
  }

  load_balancer {
    target_group_arn = aws_lb_target_group.dev-bff-service-target-group.arn
    container_name   = "web"
    container_port   = 3000
  }

  placement_constraints {
    type       = "memberOf"
    expression = "attribute:ecs.availability-zone in [ap-southeast-1a, ap-southeast-1b]"
  }
}

resource "aws_lb_target_group" "dev-bff-service-target-group" {
  name        = "dev-bff-service-target-group"
  target_type = "alb"
  port        = 3000
  protocol    = "TCP"
  vpc_id      = aws_vpc.main.id
  }

I have assign a role

# IAM Role
resource "aws_iam_role" "ecs_task_execution_role" {
  name = "ecs_task_execution"

  # Terraform's "jsonencode" function converts a
  # Terraform expression result to valid JSON syntax.
  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = "sts:AssumeRole"
        Effect = "Allow"
        Sid    = ""
        Principal = {
          Service = "ecs-tasks.amazonaws.com"
        }
      },
    ]
  })

  tags = {
    Environment = "Development ecs_task_execution_role mobile-bff"
  }
}

The error I get is

│ Error: error creating ECS service (bffMobileService): InvalidParameterException: Unable to assume role and validate the specified targetGroupArn. Please verify that the ECS service role being passed has the proper permissions.
│
│   with aws_ecs_service.bffMobileService,
│   on bffEcsService.tf line 1, in resource "aws_ecs_service" "bffMobileService":
│    1: resource "aws_ecs_service" "bffMobileService" {
│

Any advise will be appreciated.

Chris