Hi @grzegorz.lichocik,
Thanks for reaching out to us for help with this issue. @Wade_Oram is correct about how this is usually resolved. Please let us know if that works.
The instruction helps and currently Roon started but can’t see any streamers ( I have 3 different connected via ethernet home network).
Pushed the button on audio zone searching for searching devices but information is that “no audio devices found”. Regards Grzegorz
Can you please navigate to macOS System Settings > Privacy & Security > Local Network , and make sure Roon is allowed. If it is already enabled, toggle it off and on again. Then reboot your Mac, and see if the same issue persists.