BuddyPress.org

PS: I used this code in conjunction with the buddypress tool (Repair total members count):

/*
* Paste in your theme functions.php or in bp-custom.php.
* Load the site in a browser
* Remove from your theme functions.php or bp-custom.php.
*/

function buddypress_add_last_activity() {

  $members =  get_users( 'fields=ID' );
  // $members =  get_users( 'fields=ID&role=subscriber' );
  
  foreach ( $members as $user_id ) {
        bp_update_user_last_activity( $user_id, bp_core_current_time() );
  }

}
add_action('bp_init', 'buddypress_add_last_activity' );