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 RE: event notification not work
 In Plus! > Preferences > Customize! > Events Notifications > Add  
Make sure you select the contacts > Choose 'User has signed in' > Tick 'Display a popup notification..' > And 'Never expire'. 
 
Then make sure you're status is Online/Available.  
 
If you've set all that up correctly, I can't think of anything else that could be stopping them. 
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