Streaming activated but no sound @ Sonos speaker

Hey dear people, :blush::v:

I’ve just installed this seemingly helpful programm. I can see my Sonos speakers availble in the tray icon context menu. However, when I select one or both of them, the sound keeps playing on my computer.

Any ideas to what the issue might be? Anyone else with a similar experience?

Would love to hear from you. Yours,

Sebastian