Essence DLNA not working

I have a Essence mk2 just added to my network.

It works fine via the BeoMusic app.

But I cannot get it to work as a DLNA player.

I have tried different apps: Creation5, PlugPlayer, Synology DSaudio.

They all see the Essence as DLNA player, but they are unable to start the player.

Is this a common problem or limitation of the Essence?

I thought the Essence was to be also a DLNA player.