In order to provision virtual machines in the Compute vCenter, the tenant must be configured to utilize compute resources within vCenter Server.
Verify that a vCenter Server compute cluster has been deployed and configured. See Deploy and Configure the Shared Edge and Compute Cluster Components in Region A.
Verify that an NSX instance has been configured for use by the vCenter Server compute cluster. See Deploy and Configure the Shared Edge and Compute Cluster NSX Instance in Region A.
Proxy agents have been deployed.