1. Provide vCenter server credentials in order for the appliance to perform the discovery of VMs. In the same Appliance Configuration Manager portal, under Manage credentials and discovery sources. Assign a friendly name to your vCenter(s), and add the vCenter username/password and IP address/FQDN and the port.
2. Add source VM credentials, this is important to perform software inventory and for agentless dependencies.
3. Go back to the Azure portal, then select Discovered items on the left panel in Azure Migrate. A list of the discovered VM(s) should appear.