Eye tracking for avatars has been recently broken In the latest patch 2018.4.4p6, build 693.

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Confirmed in full body HTC vive trackers and without, in desktop, in several worlds with mirrors(including Avatar Testing), in the VR camera, with the help of my test account on a secondary PC, and with the help of other players/friends who had the very same problem.

Personal, public and default avatars are all affected.

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Update:

Eye tracking does work in the Open Beta.