My wife has an iCloud account and we use calendar events to highlight family staying over or working from home days, medical appointments etc.
I have an iCloud account. My wife invites me to an event she creates and I receive an email. I would expect this to come directly in the calendar app inbox.
Currently I have to open email click 'accept' which opens an iCloud url and I have to accept again for wife to see I have accepted. I then have to go back to email and open the attached .ics file and choose add to calendar for it to appear in my calendar.
My wife and I agreed to use an alias for iCloud email as the invitee address in this scenario I never receive emails of notifications.
I've contacted apple support and have a case number but at this point no solution. I'm appealing to the masses for help.
P.s both using iOS 12 on iPhone 8+ and iPhone 8. Also have iPad Pro 1st Gen also on iOS 12.