Oculus Touch buttons do not work once I've packaged my project into a exe?

I have a Oculus Rift project that works great while running in the Unreal editor, but once I've packaged it into a win 32 project the touch buttons (A, B, X and Y) do not work, but the triggers do?

I'm using Unreal 4.21 and I've set up the button mappings in C++ with PlayerInputComponent->BindAction etc. For testing I have keys also mapped to the same actions and these work fine while running the exe, it's just the touch controllers buttons that do not work.

I did notice once I run the exe it opens steam VR so I'm not sure if this is causing problems as the Vive doesn't have these buttons? How do I tell Unreal this is a Oculus build and not a steam VR build?

Does anyone have any thoughts on why my buttons do not work?