Profile tabs snippet no works

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https://docs.ultimatemember.com/article/64-extending-ultimate-member-profile-menu-using-hooks

// You could set the default privacy for custom tab and disable to change the tab privacy settings in admin menu.
/*
* There are values for 'default_privacy' atribute
* 0 - Anyone,
* 1 - Guests only,
* 2 - Members only,
* 3 - Only the owner
*/
// Filter
function um_mycustomtab_add_tab( $tabs ) {
	$tabs['mycustomtab'] = array(
		'name' 				=> 'My Custom',
		'icon' 				=> 'um-faicon-pencil',
		'default_privacy'   => 3,
	);
	return $tabs;
}
add_filter( 'um_profile_tabs', 'um_mycustomtab_add_tab', 1000 );

/**
 * Check an ability to view tab
 *
 * @param $tabs
 *
 * @return mixed
 */
function um_mycustomtab_add_tab_visibility( $tabs ) {
	if ( empty( $tabs['mycustomtab'] ) ) {
		return $tabs;
	}

	$user_id = um_profile_id();

	if ( ! user_can( $user_id, 'read' ) ) {
		unset( $tabs['mycustomtab'] );
	}

	return $tabs;
}
add_filter( 'um_user_profile_tabs', 'um_mycustomtab_add_tab_visibility', 2000, 1 );

// Action
function um_profile_content_mycustomtab_default( $args ) {
	echo 'Hello world!';
}
add_action( 'um_profile_content_mycustomtab_default', 'um_profile_content_mycustomtab_default' );