When importing the latest version 2.4.0 into Unity where the build target is set to WebGL or iOS or anything except standalone and android there are a number of errors in the console, preventing builds.

..
Library\PackageCache\com.htc.upm.vive.openxr@3dd72f5\Runtime\CompositionLayer\Scripts\CompositionLayerPassthroughAPI.cs(641,22): error CS0161: 'CompositionLayerPassthroughAPI.SetPassthroughLayerType(int, LayerType, uint)': not all code paths return a value
...

In those functions there is an ifdef missing:

#if !(UNITY_STANDALONE || UNITY_ANDROID)
return false;
#endif

This prevents us from using this version of the sdk as we are building for multiple targets, please fix asap.

Thanks,
Martin