Gatways

Hi , Anonymous 

If  your datasource  is  only in SharePoint Online ，you don’t need  to configure  gateway in powerbi service.

If you datasource is in SharePoint on-premises, you can refer to the tutorials in the following forum:

Configuring SharePoint/Folder refreshing using On-Premise Gateway

how-to-publish-sharepoint-data-to-power-bi-using-the-enterprise-gateway

You also can refer to this related post:

Power-BI-on-premise-connect-to-on-premise-Sharepoint-folder

Best Regards,
Community Support Team _ Eason
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.