Hi Thomas,
meanwhile I have found out, that it only works for the RUI (newclient), not for the UI5. I have updated the link to https://my<your tenant id>.crm.ondemand.com/sap/public/ap/ui/repository/SAP_BYD_UI/HTML5/newclient.html?sap-ui-language=en&username=<your username>&password=<your password>
Sorry for the mistake...
Best Regards,
Patric