Steps for adding new host to Workload Domain Cluster in VCF 9.x

Products

• VMware vSphere ESXi

Issue/Introduction

• You can add an ESX host to an SDDC cluster using the vSphere Client from the Management vCenter UI as explained in the documentation Add an ESX Host to an SDDC Cluster in a VCF Domain
  In the vSphere Client, browse to the vSphere cluster in the inventory.
  Select the vSphere cluster and click Actions >Add Hosts >Add Unassigned Hosts.
  Select the host to add to the vSphere cluster and click Next.
  You can view both vDS and NSX networking configuration on the cluster. Each vDS has two uplinks in it, and you can assign any free VMNICs on the host to the existing uplinks on the vDS.
  Click Next.
  Review the host, switch configuration, and license details and click Finish.
  
  
  
• However, Add Unassigned Hosts option is not available the Workload Domain vCenter

Environment

VMware Cloud Foundation 9.x

Resolution

Please Add a Host to a vSphere Cluster Using the SDDC Manager UI

Note: Hosts with differing VMNIC counts will have limitations. For example, if the current Workload Domain contains hosts that have only 4 VMNICs and a host with 5 or more VMNICs is added, 1 or more of those VMNICs will be unusable due to the requirements to maintain a uniform host image in the WLD clusters. 

Additional Information

Add an ESX Host to an SDDC Cluster in a VCF Domain
https://techdocs.broadcom.com/us/en/vmware-cis/vcf/vcf-9-0-and-later/9-0/building-your-private-cloud-infrastructure/working-with-workload-domains/expand-a-workload-domain/add-a-host-to-a-vsphere-cluster-using-the-sddc-manager-ui.html