Elgato Game Capture HD60 typically captures stereo audio via the HDMI input, along with video. However, Elgato Game Capture HD60 also has a stereo audio input. ... You can use a RCA to 1/8 inch adapter to input stereo audio. That port will become active if you select HDMI as your input, and “with Analog Audio”.
How do I get my Elgato to sound through headphones?
To capture game sound via HDMI, unplug headphones connected to the Switch headphone port. Using headphones and capturing game audio can be done by using the Elgato Chat Link cable. Learn more about Chat link here. Double-check that the Xbox One is outputting the correct audio format.