MDX request to System SSAS cube does not display the results

Hello,

I'm trying to do some requests to analyse the usage of our cubes.

All requests on $SYSTEM.DISCOVER_SESSIONS made in Microsoft SQL Server Studio or even in PowerShell are working well.

However, everytime I try to request $SYSTEM.DISCOVER_CONNECTIONS, the query is failing, I can only retrieve the XML of the result in PowerShell, but never the result of the query. It's the same with MSSS, The toolbar is totally empty after sending the query.

Is it a bug? How can we access $SYSTEM.DISCOVER_CONNECTIONS data?

Thanks