@ismaeloltra - Hello there! My name is Anthony and I am a product engineer on the ArcGIS for Power BI visual. I was looking over this issue and I would like to help out if I can!
This is actually by design. Drive time features and functionality are only available to the report author/designer. As a viewer, you will only be able to see the layer that was created by the report designer.
Please let me know if this helps!