Hi
1. Did you write the MDX query when you connect to the SAP BW? If it is, please remove the query.
2. Was the Power BI desktop installed on the same computer which hosted SAP BW? Please try to install the desktop on the same server, then connect to SAP BW.
3. Please try to use the latest Power BI desktop version.
4. Contact your SAP BW administrator and let him monitor the connection between client app and SAP BW. Check if any other app can connect to SAP successfully.
Best Regards,
Qiuyun Yu