An administrator is deploying an NC2 cluster into an existing AWS VPC.

The administrator has not created the necessary Security Group:

The error message indicates that the creation of network interfaces in a shared subnet requires specifying a security group. This means that the necessary security group has not been created or assigned to the network interfaces.

Creating the appropriate security group and ensuring it is associated with the network interfaces during cluster deployment should resolve this issue.

References:Refer to AWS documentation on security groups and network interface configuration and Nutanix documentation on prerequisites for deploying NC2 clusters in an existing AWS VPC.