Hello @Derek_Harmanli,
Thanks for contacting support, I’d be happy to take a look over this issue with you. Can you please provide more information regarding your setup using this thread as a guide?
Can you please let me know what your Core machine model/manufacturer is, what kind of DAC you have connected to it and a screenshot of your Roon Settings -> Audio page? Can you please try rebooting your Core machine?
Thanks,
Noris