Faced with the need to make an application for Pico with eye tracking for the PC version (via Pico Connect). Previously, I did it on earlier versions for Android and everything worked there. However, on version 5.5 and for PC (not Android) eye tracking - does not work. Installed PicoOpenXR from the fab library. (Version up to 5.5 is supported), There is a checkbox in the eye tracking settings - but the necessary nodes are not.
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Perhaps you need to enable eye tracking in the Pico Connect or SteamVR app?