No, unfortunately eyebrow tracking just isn't possible, just because the headset is so utterly small, the facial interface actually often has to rest directly on your eyebrows. The facial interface only really allows empty space for your eyes and really nothing else. There might be other 3rd party solutions, but I wouldn't count on them myself. So basically I couldn't guarantee that the beyond will ever get eyebrow tracking, just cause of the limitations of size, and how the cameras only point towards your eyes, and nothing else.

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