I use a connexionString odc for use a multidimensionnal data Cube...
<odc:ConnectionString>Provider=MSOLAP.4;Password=fdsfd;Persist Security Info=True;User ID=Robert;Data Source=https://www.ws.com/olap10/msmdpump.dll;MDX Compatibility=1;Safety Options=2;MDX Missing Member Mode=Error;Roles=Role;Extended Properties="CustomData=Kje0c7250-25438-14e6-ag4c-d36a402f2f5d";Locale Identifier=1036</odc:ConnectionString>
It's possible with Power BI that use this connexion ?