I have an ECSRun for a hello world that appears to be hanging. I've successfully pushed the image to ECR via the Docker() storage, and the task shows up as scheduled in Prefect Cloud - which can also see the ECS Agent I added following the guide (https://docs.prefect.io/orchestration/agents/ecs.html#running-ecs-agent-in-production). I'm a bit puzzled on how to proceed to debug why the agent isn't popping the task from the queue in the cloud.

Is it stuck in scheduled or submitted?

Scheduled, I believe. "Task Run Created"

It sounds like this might be a labelling issue

Ah, indeed. Changing the tag from dev to prod. So I can effectively use tags as well to guide workflows to appropriate ECS clusters?

Yes you can use the labels to point Flows to the appropriate agent