The customer may encounter issues when deploying VeloCloud Edges on an Azure vHub if another routing NVA is already running.
All Vmware Velocloud Sd-wan Edge Appliance
Your two options are:
Use the Palo and Velo in two separate hubs.
Deploy the Velo in a spoke connected to the vWAN hub and use BGP peering.
To do this, the customer will need to deploy the Edges in a VNET using an ARM template, then follow the steps outlined here to connect to the vWAN hub:
Azure vWAN Hub Connection Guide