Our app (which supports Apple Watch, and uses watchOS 2) was rejected with the following reason:
We discovered one or more bugs in your app when reviewed on Apple Watch.
Specifically, your Watch app fails to launch when tapped on.
Next Steps
Please debug and resubmit your app for review.
It works and launches fine on our Apple Watch running watchOS 2.
Does anyone know what could cause the app not to launch on the watch during testing by Apple?