Most instances must be run inside a VPC. Each VPC has subnets, each subnet is bound to an availablitiy zone. Make sure the subnet’s IPv4CIDR is set to 10.0.0.0/24. Back in the main config, make sure there is a security group assigned (VPC instances all must have one). And make sure to Auto-assign an IP or you can’t login to the instance! For the security group, edit the Inbound and Outbound rules: