In OpenShift Container Platform version 4.14, you could install a cluster on Amazon Web Services (AWS) with compute nodes running in AWS Outposts as a Technology Preview. As of OpenShift Container Platform version 4.15, this installation method is no longer supported.
Instead, you can install a cluster on AWS into an existing VPC and provision compute nodes on AWS Outposts as a postinstallation configuration task.
For more information, see Extending an AWS VPC cluster into an AWS Outpost