Mine worked with premium license and have 1. installed the gateway ensure that you publish your report on your premium workspace (Diamond icon there you will see) just publish on your workspace.

How to publish you do this File > Publish > Publish to Power BI

After this ensure you link your dataset to the gateway let's say its SQL Server right add your password etc to link it ensure its correct.

Under dataset settings you have to enable "Schedule Refresh"

The catch here is the user should have Powerbi Pro or Premium