VM deployments from VCF Automation 9.1 stuck indefinitely with status "powering on"

Products

• VCF Automation

Issue/Introduction

• Attempting to deploy VM from VCFA tenant portal > Build & Deploy > Services > Virtual Machines > Create New Virtual Machine > From OVA : Fill Name | Select template | Skip configurations and guest customizations | Configure the network settings : Submit.
  Leaves the deployment stuck indefinitely in "powering on" state. and the deployment is marked 'Ready' or the deployment being marked "Unkown". 
  
  
  
  
• The VMs are stale and can't be managed thereafter from VCFA as the request is stuck. 
• Under the deployment view, there are createFailure Warning events with details similar to "network interface "ethO" error: network interface is not ready: SubnetPortNotReady - error occurred while processing the SubnetPort CR. Error: nsx error code: 520012, message: IpAddressBlocks path=[/orgs/default/projects/<projectID>/infra/ip-blocks/<accociated_1_ip_block_id>,/orgs/default/projects/<projectID>/infra/ip-blocks/<accociated_ip_block_2_id>, ...] do not have spare capacity to allocate CIDR of size 32."
  
  

Environment

• VCF Automation 9.1

Cause

• The associated NSX IPBlock has insufficient available IP capacity to allocate the required CIDR block, causing the SubnetSet creation to fail for the respective network.

Resolution

• Ensure that the IPBlocks on NSX associated to the respective network have sufficient ip address capacity to fulfil the requirements.