ReflectionProbe.RenderProbe() not working on Android

In my project I have a curved reflective wall that is generated when the scene loads. During the generation, I create ReflectionProbes at intervals along the wall. I then call .RenderProbe() on each in turn and then wait for the job to complete on all of them before starting the scene (switching cameras on, allowing the player and NPC's to move etc.) This all works well in the editor but when I build for Android the call to RenderProbe() does exactly nothing. Calls to isFinishedRendering() never return true.

My guess is that I'm missing a setting somewhere but so far I haven't found it.

Any suggestions about where to look or things I should check are welcome.