Cluster transition from baselines to Image fails with error "Failed to inspect transport node configuration in the cluster"

Products

• VMware SDDC Manager / VCF Installer

Issue/Introduction

• Cluster transition from Baselines to vSphere Lifecycle Manager Image on the SDDC Manager fails at 'Inspect TransportNode Configuration in the cluster' task with error:
  
  Message: Failed to inspect transport node configuration in the cluster
Remediation Message:
Reference Token: ######
Cause: Cannot Invoke com.vmware.vapi.bindings.Structure_convertTo(java.lang.Class)" because the return value of "com.vmware.nsx_policy.model.HostTransportNode.getHostSwitchSpec()" is null
  
  
• The below article is used to transition a cluster from baseline to  Lifecycle Manager Image using Powershell:
  Transitioning vSphere Lifecycle Manager Baseline Clusters to vSphere Lifecycle Manager Image Clusters Using PowerShell
  
  
• On the SDDC Manager, in /var/log/vmware/vcf/domainmanager/domainmanager.log:

YYYY-MM-DDTHH:MM:SS ERROR [vcf_dm, ###############,####] [c.v.e.s.o.model.error.ErrorFactory,dm-exec-6] [#####] FAILED_TO_INSPECT_CLUSTER_TN_CONFIGURATION Failed to inspect transport node configuration in the cluster
com.vmware.evo.sddc.orchestrator.exceptions.OrchTaskException: Failed to inspect transport node configuration in the cluster
Caused by: java.lang.NullPointerException: Cannot invoke "com.vmware.vapi.bindings.structure.convertTo(java.lang.Class)" because the return value of "com.vmware.nsx_policy.model.HostTransportNode.getHostSwitchSpec()" is null

Environment

VMware Cloud Foundation 5.x

Cause

The Transport Node Profile (TNP) was missing for the affected cluster in NSX Manager, under System -> Fabric -> Nodes -> Host -> Transport Node Profile.

Resolution

1. On the NSX Manager, navigate to System -> Fabric -> Profiles -> Transport Node Profiles and create a valid profile for the affected cluster using the correct VDS and Transport Zone settings.
   Refer Adding a Transport Node Profile
   
   
2. Navigate to System -> Fabric -> Nodes -> Host Transport Nodes, select the affected Cluster, and click Configure NSX to apply the profile.
   Refer Prepare ESXi Cluster Hosts as Transport Nodes by Using TNP