Launch T2, C4 or M4 AWS instances
T2, C4 and M4 instances can only be launched in an Amazon Virtual Private Cloud (VPC). A default VPC is usually configured for an AWS account when it is first created, but some older AWS accounts may not have this default VPC. For these accounts, it is not possible to launch T2, C4 or M4 instances.
To resolve this, create a new AWS account. Read more about this in the AWS documentation.