The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
https://blog.ulifestyle.com.hk/article/smonkichi/4221578/%E7%B5%82%E6%96%BC%E6%89%BE%E5%87%BA%E8%84%AB%E9%AB%AE%E7%9A%84%E5%8E%9F%E5%85%87-dht-%E4%BD%A0%E8%AA%8D%E8%AD%98%E5%97%8E