DepthAPI Occlusion Lit conflict with stencil shader

There’s no reason why you need to use the occlusion shader on the environment through the portal. You could just occlude only the stencil surface. If a stencil fragment is occluded, so is everything behind it

edit: this may not work with soft occlusion and it may not look right with the right-eye depth reprojection. I’m playing with a similar issue and will get back to you if my other solution works out

Here it is, its really basic : 

Shader "Custom/StencilPassthroughShader"
{
    Properties
    {
        [IntRange] _StencilID("Stencil ID", Range(0, 255)) = 0
    }
    SubShader
    {
        Tags
        {
            "RenderType" = "Opaque"
            "Queue" = "Geometry"
            "RenderPipeline" = "UniversalPipeline"
        }
        Pass
        {
            Blend Zero One
            ZWrite Off
            
            Stencil
            {
                Ref[_StencilID]
                Comp Always
                Pass Replace
            }
        }
    }
}

Did you ever find a solution? I'm dealing with a similar challenge.

I have setup my stencil but its not working too.

You can add your meshfilter to the Environment Depth Manager's Mask Mesh Filters, and it will remove it from the depth map. Works for my stencil shaders, at least. It doesn't look the best when using soft occlusion. But it works at least. I have also set the shader to user Environmental Depth Bias -0.07. Worked best for me.

Do you mind if I ask how you got the stencil shader to occlude? I currently am working on a similar setup, and while the depth occlusion is working great on objects with an occlusion shader, it is not working on the stencil as it is (which is much the same as yours), and it sounds like you have it working with occlusion without needing to modify the shader?

As to your original question, as Sandstedt pointed out, the Depth Mask Mesh Filters is probably your best bet. You can also add the meshes to the depth mask list automatically with code, shown here: https://developers.meta.com/horizon/documentation/unity/unity-depthapi-occlusions-advanced-usage#using-the-depth-mask-feature (before I got started, I knew I would have a similar issue, and that's what came up)