Enable BuddyPress Mentions and also Email Notifications in bbPress

BuddyPress @mentions were working perfectly within WordPress posts and comments however not in bbPress.

This is one solution to get @mention user lookups and an email notification when used in a topic or thread reply.  However a notification is not logged within BuddyPress.

First create or modify the following file in your WordPress install
/wp-content/plugins/bp-custom.php

Sources:

bp-custom.php

https://gist.github.com/imath/5a3c4ac645ec765863f2

<?php
function custom_bbpress_maybe_load_mentions_scripts(
$retval = false ) {
if ( function_exists( 'bbpress' ) && is_bbpress() ) {
$retval = true;
}
return $retval;
}
add_filter( 'bp_activity_maybe_load_mentions_scripts', 'custom_bbpress_maybe_load_mentions_scripts' );

Then you will need to install the bbPress Toolkit plugin for WordPress.

Once activated navigate to Tools -> bbP Toolkit in WordPress Dashboard. Then choose Extras at the top and confirm mentions are enabled.

A second option is to use the bbp Mentions Suggest plugin available at this website:

bbp Mentions Suggest