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Does the new cluster in ECS have exactly the same name? Have any changes been made to the ASG (I assume you're using one based on the question tags)?
Instances are registered to the cluster via the ECS agent on boot based on the Userdata injecting the cluster name to the ECS config: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/bootstrap_container_instance.html#bootstrap_container_agent