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Notice in vRealize Orchestrator that the Release workflow is executed. In NIOS Grid Manager, notice that the IP address of the VM was reclaimed. In the NSX deployment in vRA, notice that the VM is destroyed.
When you destroy the entire NSX deployment item as described in De-provisioning a VM, you can notice in vRealize Orchestrator that thee Release workflows are executed, which corresponds to the NSX load balancer and the two VMs. In NIOS Grid Manager, the IP addresses are released back to the pool.