I contacted my installer's distributor's tech support person and gave the MAC ID, who in turn contacted Latham and got my MAC ID added to their server. I then registered my device successfully on the CoverStar - Sign In website. Now I get notifications on my email and text message.
There's a glaring security issue though - CoverStar - Sign In is insecure - it uses http. It does not work over https. This will expose the user's login and password and is vulnerable to security attacks. Latham needs to implement https on the server - both for user logins and for touchpad's server queries.