BDA-3 DAC does not receive any signal from Antipodes S30


My S30 is connected to a Bryston BDA-3 DAC through a USB cable. Roon core is installed on the S30. I can see the S30 in the list of Roon ready devices and I can activate it as the Roon audio output. But the BDA-3 does not receive any signal. I checked that the USB cable is correctly connected and in good condition, I replaced it with a new cable of the same type and I also checked the Roon settings with the help of Roon support.
Could you please help me resolving this issue?
Thank you.

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