To prepare for VMware VM assessment, you need to:
Verify VMware settings. Make sure that the vCenter Server and VMs you want to migrate meet requirements.
Set up permissions for assessment. Azure Migrate uses a vCenter account to access the vCenter Server, to discover and assess VMs.
Verify appliance requirements. Verify deployment requirements for the Azure Migrate appliance, before you deploy it in the next tutorial.
Reference:
https://docs.microsoft.com/en-us/azure/migrate/tutorial-prepare-vmware