So far i dont think Q6 sends notifications like RRs to say you forgot to lock etc. It confirms action in app if you ask to lock or unlock for example but no seen anything outside of that.
I miss these in my Q6. My previous Range Rovers have had this standard for years and great reminders when on unfamiliar roads. I sure someone will work out how to load POI's via USB stick.
I think your phone should have notification settings you can enable for the MyAudi app too.
Also under Account in App settings you'll find a section for Push Notifications you can enable for the app.