Applying a LUT on quest pro color passthrough

Working on a mixed reality experience at the moment and trying to get a color LUT on the OVR layer to edit the mood of the color passthrough on quest pro.

I've made several different LUT's trying a range of different compression and build settings using meta's documentation.

https://developer.oculus.com/documentation/unity/unity-passthrough-creating-color-luts/

https://developer.oculus.com/documentation/unity/unity-passthrough-neutral-color-luts/

Compression Settings

Extra Details
Unity 2022.3.5f1
Graphics - Vulkan
Color Gamut - sRGB

Haven't been able to see the effect of the LUT come through on the color passthrough.

Understand it's an experimental feature so maybe a little bit untested but curious if anyone has had success in making them work ?? Is there a simple step / setting I'm missing?