Trying to launch a Fargate task that uses an EFS Volume.

When starting the task from ECS Console, I'm getting this error :

```
ResourceInitializationError: failed to invoke EFS utils commands to set up EFS volumes: stderr: Failed to resolve "fs-019a4b2d1774c5586.efs.eu-west-1.amazonaws.com" - check that your file system ID is correct, and ensure that the VPC has an EFS mount target for this file system ID. See https://docs.aws.amazon.com/console/efs/mount-dns-name for more detail. Attempting to lookup mount target ip address using botocore. Failed to import necessary dependency botocore, please install botocore first. : unsuccessful EFS utils command execution; code: 1

```

File system Id is correct. I've mounted the volume from an ec2 instance in the same VPC, all good.

Following steps defined here : <https://aws.amazon.com/premiumsupport/knowledge-center/ecs-fargate-mount-efs-containers-tasks/?nc1=h_ls>

I cannot figure out where to specify outbound rule for ECS service or task. [See image](https://i.stack.imgur.com/K6Ko3.png)

Thanks in advance.