Email Subscriptions in Power Bi Report Server

The documentation for how to configure the email settings is here
https://docs.microsoft.com/en-us/sql/reporting-services/install-windows/e-mail-settings-reporting-services-native-mode-configuration-manager?view=sql-server-ver15

These docs were originally written for SQL Server Reporting Services, but Power BI Report server uses the same email engine internally.

The above documentation is linked in the Additional Configuration section for Power BI Report Server here:

https://docs.microsoft.com/en-us/power-bi/report-server/install-report-server#additional-configuration