Open DaVinci Resolve
Click DaVinci Resolve in the top menu
Select Preferences
Click Video and Audio I/O
Find the Audio I/O section
Choose the desired audio device from the Output Device dropdown
Choose the desired audio device from the Input Device dropdown if needed
Click Save
Restart DaVinci Resolve if required
For timeline playback, go to Fairlight
Open Fairlight menu
Select Patch Input/Output if needed
Assign the correct audio outputs to the timeline or bus
Check the system audio settings if the device does not appear