The feature will not require any additional settings from community administrators or moderators. Settings related to privacy and security will not change either.
If the member has not set a username for themselves, @mention will not work. Users can toggle into their profile settings to create a username.
How it works: @mentions will function in line with commonly accepted Internet standards. A user typing @“user name” will see an auto-complete list of matching usernames to select from. The selected user will receive an email pointing towards the referenced content. In private campaigns it is not possible to send @mention notifications to members who do not have access to the campaign. This feature also has curse filtering applicable in case an inappropriate name is used as a user name.
On a successfully login to a community by a new user, a screen to set your profile/username pops up as shown in the image below

A user can use @mentions while commenting on an idea which looks like the image below.

It also can be used to mention while submitting an idea in the description field. 

@mention feature is also available to members who has access to Stage specific comments tab as well. For example: Build Stage, Review Stage Assessment Stage.

A notification email is sent to the particular user on being mentioned in the community (this can be turned on or off in the emails notification settings area). 

Note: SSO communities can pass usernames via ADFS as a SAML attribute and map it to username.

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