How do individual users in my organization sign up?
There are three scenarios that might apply to users in your organization:
Scenario 1: Your organization already has an existing Office 365 environment and the user signing up for Power BI already has an Office 365 account. In this scenario, if a user already has a work or school account in the tenant (for example, contoso.com) but does not yet have Power BI, Microsoft will simply activate the plan for that account, and the user will automatically be notified of how to use the Power BI service.
Scenario 2: Your organization has an existing Office 365 environment and the user signing up for Power BI doesn’t have an Office 365 account. In this scenario, the user has an email address in your organization’s domain (for example, contoso.com) but does not yet have an Office 365 account. In this case, the user can sign up for Power BI and will automatically be given an account. This lets the user access the Power BI service. For example, if an employee named Nancy uses her work email address (for example, Nancy@contoso.com) to sign up, Microsoft will automatically add Nancy as a user in Contoso’s Office 365 environment and activate Power BI for that account.
Scenario 3: Your organization does not have an Office 365 environment connected to your email domain. There are no administrative actions your organization needs to take to take advantage of Power BI. Users will be added to a new, cloud-only user directory, and you will have the option to elect to take over as the tenant admin and manage them.
IMPORTANT: If your organization has multiple email domains and you prefer all email address extensions to be in the same tenant, add all email address domains to an Azure Active Directory tenant before any users sign up. There is no automated mechanism to move users across tenants after they have been created. For more information on this process, see If I have multiple domains, can I control the Office 365 tenant that users are added to? later in this article and Add your domain to Office 365 online.