How to get Fargate task IP address (boto3/Python)

**EDIT: **When exporting correct AWS username access keys in used docker image, boto3 started working. However I could not get in working without exporting access keys

I need to get my Fargate task IP address in order to connect Redis running in the task. If I just use public IP (hardcode) , its all fine, but when I try get get address using boto3 /Python/Flask server) , will get "no cluster found error message" for task log. Cluster does exists in the region I am using and I can check cluster/service/my task data fine via console UI /ASW cli. Here is code snippet used:

    ecs = boto3.client("ecs", region_name="eu-north-1")
    cluster_name = "my-cluster-name"
    service_name = "my-redis-service-name"

    tasks = ecs.list_tasks(cluster=cluster_name, serviceName=service_name)['taskArns']
    if not tasks:
        return None

    task_desc = ecs.describe_tasks(cluster=cluster_name, tasks=tasks)['tasks']
    for task in task_desc:
        for attachment in task.get("attachments", []):
            for detail in attachment.get("details", []):
                if detail["name"] == "privateIPv4Address":
                    return detail["value"] 

    return None