Meta Voice SDK on Unreal 5.5 not working in packaged game

Hi,

I'm having issues getting the voice SDK to work in Unreal 5.5 packaged (dev and shipping) builds.
In editor, everything works fine, but when I package, there is no recognition whatsoever.
It looks to initialise fine with following log:
  LogWit: Display: BeginPlay: Connection Started

but when I press the button to actually start the recognition (which works in editor), I get following log:
  VoiceCapture - Stop: voice capture ptr is not valid. Make sure it is setup correctly

Setup looks to be fine according to the (limited) documentation, and the fact it works in editor makes me believe setup should be ok.

Anyone having same/similar issue or knows a way to fix this?