Millet cloud Service read the other party's short message. Does the other party know?

I don't know. According to Xiaomi official website's information, there is a prompt in millet cloud service. Because you log in to the cloud service, the other party will not know after reading the text message. For the security of the account, it will be prompted on the mobile phone. Notify by SMS or message to remind someone to log in to the cloud service.