In these difficult times, the use of technology and remote connectivity is crucial. I have seen an increasing number of requests between companies and partners to allow remote access to perform activities in Azure subscriptions. In this article, we are going to cover the required steps to allow an external user to authenticate and access your Azure resources. We are going to cover what the cloud administrator can use to track and understand the usage and permissions given to any external account.
Reference: http://techgenix.com/external-access-azure/