I think you need to lock the profile to the key. I only use one key, on entry the screen says welcome and my first name (you can edit what you want it to say in the app)
I've just unlocked the car with the key I haven't used - the screen displays Welcome and asks me to choose a profile; my name or guest
There's a padlock symbol 'locked' on my name profile.
I assume I could lock my preferred profile to both keys.