Cannot connect Logic X to companion to send midi triggers

Pretty much as the title, really!

I am trying to program midi notex in logic to run alongside playback audio for a performance - in turn I want this to trigger macro camera moves in my Backmagic ATEM switcher - getting buttons to send triggers to the macros is fine but I canot (despite following all online advice using Mac midi ports, sending notes in logic etc) to get companion to see the midi info coming in from logic.. does anyone have any idea where I can find a solution to this. It’s infuriating - I’ve been researching and trying this on and off for around 10 days now…!