Custom message admin for new user

In the other post you said this would be the code to send a specific message when a new user is registed.
But for some reason, the USERNAME, USEREMAIL, SITENAME and ADMINURL isnt working.

Can you help?

/**
 * Modify the contents of the message sent to the admin when a user signs up.
 *
 * @param $message The default message.
 * @return string the updated message.
 */
function my_custom_message( $message ) {
	$new_message = 'USERNAME (USEREMAIL) has requested a username at SITENAME' . "\n\n";
	$new_message .= "SITEURL\n\n";
	$new_message .= 'To approve or deny this user access to SITENAME go to' . "\n\n";
	$new_message .= "ADMINURL\n\n";

        return $new_message;
}

// modify the message sent to the admin
add_filter( 'new_user_approve_request_approval_message_default', 'my_custom_message' );

https://ww.wp.xz.cn/plugins/new-user-approve/