Notifications using @mentions in CA Agile Central do not work for some users

Document ID : KB000091932
Last Modified Date : 19/04/2018
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The notification options "@mentions" does not appear in the Detail page of the User Story.   The user has Editor permissions and has notifications turned on.  He can receive them, but cannot create a notification since the @mentions option is not there. 
@mentions are only available on Quick Detail Pages (QDP's). So if you are using the old editor (EDP), on the Detail page of a User Story, on the right side of the page, you will see the icon for QDP.   If you click on the icon it will open up the page in QDP.   Scroll down to the Description Notes, you should see the "@" button which is available on user stories, portfolio items, defects and tasks. 

User-added image

Additional Information:
Additional Information about @mentions can be found in CAAC Help file