R Visuals on Power BI Report Server

Hello everyone, 

I'm currently trying to add R Visuals in Power BI Dashboard that will be published on my institutionnal Power BI Report Server. 

On Power BI Desktop, I use to use 

- R visuals proposed by Power BI 

- Custom Visualisation created with R and Plotly that I've created following this tutorial : https://radacad.com/interactive-map-using-r-and-power-bi-create-custom-visual-part-1

Both used to work well in Power BI Desktop. 

In Power BI Report Server, no visuals are displayed with the current errors: 

- R Visuals : "The visual elements R are currently disabled in your organization"

- Custom Viz. with R : "This visual element cannot be displayed. Try again later or contact support. If you contact support, provide this information."

I've also tried with Python visuals with the following error : "Python visuals are only supported in Pwoer BI Desktop"

From what I understand, It seems that among this three possibilities, only R visuals are available but I need to enable them at an organizationnal level. 

Would it be possible to have some help regarding this activation ? 

Thank you for your help

Romain