Scheduled Refresh Outtage

I had the same issue with my reports.  When one of our DBA's changed something in one of the data warehouse tables, it caused the problem.  My desktop version refreshed just fine with my revised SQL query.  The Power BI service is what was causing the problem.  It was seeing the old data set and not the new one that I had to revise on the desktop.  I would suggest seeing if your administrators changed anything in the data warehouse tables, recently.  Any reports that utilize a revised table, you may have to go into your Power BI service, delete them, and then reload them.  In my case, we changed one simple little thing in a table, an order type.  The order type was replaced with a new name.   Hope this helps.