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It is hard to diagnose without knowing too much about your cluster. One thing that comes to my mind is, check if you have assigned your EC2 instances and IAM role that has a policy attached to it that would allow the EC2 service to perform various ec2 and ecs actions. Here’s more about it: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/instance_IAM_role.html

My issue was adding lines to the userdata to register with the cluster 😞