The following reasons may play a part in triggering this FileType error: The file format could indeed be the cause for FileType selected not being supported by Teams, Excel, etc.

If you get the Download did not complete error message when using Power Query in Microsoft Excel, use these fixes.

Fix the "Retrieving Data. Wait a Few Seconds" error in Microsoft Excel with these effective solutions, including deactivating browser extensions, clearing cookies ...

How to Recover a Microsoft Excel File That Is Not in a Recognizable Format. If Microsoft Excel fails to recognize a file in the XLSX or XLS format, the data contained in the file could be corrupted.