Do Salesforce users need Power BI licenses to view embedded data visualizations?

We have the following questions about the Embedding a Power BI report into Salesforce page located at: https://powerbi.microsoft.com/en-us/blog/embedding-a-power-bi-report-into-salesforce/

1. What application is being registered by Azure AD? Salesforce and/or Power BI?
2. Which edition of Azure AD is required to register the application? Free, Basic, Premium P1, or Premium P2?
3. Does anyone know of any specific instructions on how to register the Salesforce or Power BI application in Azure AD? The link to the guide shown below on the Embedding a Power BI report into Salesforce page is broken.

Azure Active Directory registration

The authentication flow from Salesforce to Power BI is an authorization code flow. For this flow to work, you must register an application in Azure AD. This establishes an identity for your application and specifies permissions to Power BI REST resources. To register an application, follow this guide. (https://docs.microsoft.com/en-us/power-bi/developer/register-a-web-app/)