Unable to refresh Excel Hosted in Power BI Report Server

[SureshM]

Hi,

I have an Excel saved in Power BI report server web portal that connects to SSAS cube. When i refresh the pivot it throws the following error: "This workbook contains external data connections or BI features that are not supported"

The Office web apps server is already configured to allow external connections. Is there anything I'm missing?

[Ccparkhill]

Is the machine account of the OOS server an SSAS admin? This link might help:
https://docs.microsoft.com/en-us/power-bi/report-server/excel-oos#using-effectiveusername-with-analy...