Hello Prateek
After working with appDynamics support, the missing piece for us was to run the machine agent container using the DAEMON strategy in ECS:
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_services.html#service_scheduler_daemon
Once we did this, we got past the errors and were able to start the container.
Additionally, we had to add the following mounts to the task definition
/:/hostroot:ro
/var/run/docker.sock:/var/run/docker.sock
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