Power BI Report Builder is a new tool, built on SSRS platform which uses a different engine compared to the old Power BI desktop tool built on SSAS platform. Currently, Power BI Report Builder tool supports connectivity to limited data sources and it does not include Denodo.
We encourage you to vote in Microsoft’s public idea to include Denodo as one the data sources for Power BI Report Builder using this [link.](https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/37568140-make-denodo-be-supported-data-source-in-power-bi-r)
Hope this helps!