My EgyptAir-operated flight was an AC codeshare on an AC ticket.
And of course I didn't push for access-how often do lounge agents give entry to someone who isn't entitled?
I simply have no idea what the agents could see on the screens. My guess is that they had to manually retrieve it from their system.
Just to reiterate- the AC app was clearly showing that I would get access at YVR and LHR. This inconveniently disappeared after the Amadeus switch on Nov 18th.