I have created a report using SSAS in Power BI Desktop and published it. I have configured a gateway in power BI service for data refresh. I have also mapped and added a Effective Username and provided my domain upn. On testing, it shows "Online , good to go". But when I come back to view my report, I get an Error "There was a data source error." Can anybody help me with this issue? Please find below snapshots for reference:
Thanks in advance.
From your description, it seems that you could configure the Gateway and add Data source successfully.
It means that your SSAS server and gateway are installed in a same domain or trusted domains.
So the error may be caused by Map user name.You could have a reference of this similar thread which has been solved.