During virtual network setup, if you use ExpressRoute with network peering to Microsoft, add the following service endpoints to the subnet in which the service will be provisioned: * Target database endpoint (for example, SQL endpoint, Cosmos DB endpoint, and so on) * Storage endpoint * Service bus endpoint This configuration is necessary because Azure Database Migration Service lacks internet connectivity. Reference: https://docs.microsoft.com/en-us/azure/dms/tutorial-sql-server-to-managed-instance