Cloud-built daydream builds "incompatible", phone seems to think it's a cardboard app

We have a daydream app that builds to android, and runs great when built from any of a number of windows or OSX machines.

However when we install an android cloud build, on boot the game pops a native dialog:

Incompatible App
This cardboard application is not compatible with Daydream headsets

…and we can proceed no further.

If we go into the phone’s daydream settings → developer options and toggle Skip VR Entry Screens (which is a pretty nice optimisation for development anyway) then it boots fine.

What do we/unity need to do to properly support daydream builds? Is this possibly a problem with our local setup?

bump?