SDDC Manager is displaying blank page on step 2 of NSX edge expansion wizard

Products

• VMware SDDC Manager

Issue/Introduction

SDDC Manager UI shows spinner on second step in Expand Edge Cluster Wizard spinning endlessly: 

Environment

• VMware Cloud Foundation 4.x
• VMware Cloud foundation 5.x

Cause

This is failing due to a timeout in larger scaled environments.

Resolution

Fixed in VCF 5.2.1.

Workaround: 

Use the following API or Developer Center.

1. Call Edge expansion validation API   (This prechecks the edge expansion )
   POST /v1/edge-clusters/<edge_cluster_sddc_inventory_id>/validations
   
   
2. Edge Expansion API:
   PATCH /v1/edge-clusters/<edge_cluster_sddc_inventory_id>