Microsoft has announced that, as of Sept. 29, upload of local Excel workbooks to Power BI workspaces will no longer be allowed, nor will configuring of scheduled refresh and refresh now for any Excel files that don’t already have scheduled refresh configured.
As of Oct. 31, scheduled refresh and refresh now will cease to be supported for all files, and local workbooks uploaded to Power BI workspaces will no longer open in Power BI. However, existing workbooks will be downloadable, and Excel workbooks may be imported from OneDrive and SharePoint Document libraries for viewing in Power BI. Excel data models may also be published as Power BI datasets.
In the announcement, Microsoft offers guidance to Power BI admins to help them discover affected workbooks.