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I created a shortcode to display a list of group members, but I always get the “This group has no members” result. What is wrong here? The group with ID 2 exists and have one member.

add_shortcode( 'group_members', 'list_group_members' );

function list_group_members() {

global $bp;

if ( bp_group_has_members( 'group_id=2' ) ) {
 
  echo '<ul id="member-list" class="item-list">';
  while ( bp_group_members() ) : bp_group_the_member();
 
    echo '<li>';
      // Example template tags you can use 
      bp_group_member_name();
      bp_group_member_avatar();
      bp_group_member_link();
      bp_group_member_joined_since();
    echo '</li>';
  endwhile;
  echo '</ul>';
 
} else {
 
  echo '<div id="message" class="info">';
    echo '<p>This group has no members.</p>';
  echo '</div>';
 
}

}