URP Camera Opaque Texture is blank on android build

Unity 2019.4.0f1,
XR enabled,
URP enabled

Problem:

When rendering using the camera opaque texture, the resulting texture is blank. This works OK in-editor as well as PC build, but android does not show any useful information.

A renderdoc capture shows that everything is being rendered as expected, but the output from the rendering of the small screen, who's source texture is the camera opaque texture, appears incorrect e.g. single color blank.

I did try to attach a sample, but could not due to size limits.

I've confirmed that the opaque texture is enabled, post-processing is disabled.

Any suggestions would be appreciated.

Biscuit.