You’re on the right track. What does your code look like? One thing that jumps out at me is that you said EarthCenteredEarthFixedToLongitudeLatitudeHeight, but it sounds like you want to go the other way. LongitudeLatitudeHeightToEarthCenteredEarthFixed followed by CesiumGeoreference.TransformEarthCenteredEarthFixedPositionToUnity. Also note that longitude is first (X coordinate)!
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