Unable to connect EC2 instances

Unable to connect AWS EC2 instances in us-east-1 region .
Please look into this issue

Instance connect is not supported. Please use ssh on your host machine using the private key you save earlier. i.e:
ssh -i private.pem ec2-user@40,12,34.65

there is an another issue of IAM role/permission as well apart from accessioning EC2 instance for ELB ,ECS and EKS as well

Not all services are supported in the AWS Playground so you will see errors. Please refer to the playground page:
AWS SandBox Playground | KodeKloud

If you want to setup EKS look at this Terraform guide:
certified-kubernetes-administrator-course/managed-clusters/eks at master · kodekloudhub/certified-kubernetes-administrator-course (github.com)