I wish they would rather fix their Proton Calendar app. It is really useless to have notifications coming on email as "Reminder: event starting at 6:00 PM". You know when it starts. There is a link to an event. Why also not put there title of the event?
Thanks for the feedback! We released a new feature on iOS: a new calendar invite widget now shows the main event info in all emails that contain event invites. Tapping on it takes you to the Proton Calendar app directly from your inbox.
My guess is some kind of security/privacy angle to not leak that information (maybe to Apple, who sees the contents of push notifications?). I don’t know - just speculating.
