I have same problem as a query raised back in May 22 by another user. That thread has been closed with no resolution.
The problem is = Streamdeck doesn't work when running OMSI via BCS. (streamdeck does work when opening OMSI without BCS)
The advice given by Laurin was to install Antimacro.
I have installed Antimacro from Microsoft store, but when running as administrator, Antimacro does not find Streamdeck.
Antimacro does find my Logitech Wheel, but there doesn't appear to be a way to manually add the Streamdeck (I'm not sure if adding Streamdeck was the intention of installing Antimacro or not)
Are you able to provide any further assistance please?