Solid background when trying to enable passthrough; proxy layer could not be found

I wrote a simple app (using XrBodyFaceEyeSocial and XrSptaialAnchor in the Samples/XrSamples folder as a template) where I would like to use passthrough. In the logcat, I see the following and I am not sure how to interpret it.

CompositorVR: Unmatched layer (ID 1162, content 3) used as replacement for background passthrough layer, because its required proxy layer could not be found

More details, I tried to port over the Creation of the passthrough layer from XrSpatialAnchor into the script for XrBodyFaceEyeSocial.