At a minimum, eARC requires that both an audio device and its connected HDMI port support HDMI 2.1. If you're unsure, check your audio gear's specifications, and connect it to the port marked "eARC" ...
Ideally, we’d like to see the Switch 2’s dock support the latest HDMI standards and be compatible with TVs that can support variable refresh rates, so that the latest TVs can get the most out ...