iCloud sending emails instead of Notifications

i'm having issue icloud calendars.
when create event in icloud calendar , add either colleague or wife sends them email, despite both having @me.com addresses.

it's same when send me calendar. email redirects me icloud website accept event. can add event calendar.

i'm not sure whats happened worked fine first 2 weeks of ios 5 when 5.0.1 released stopped!

help?

 

Forums iPhone, iPad, and iPod Touch iOS Older iOS Versions iOS 5 and earlier

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