Sending a link and going to it from the website are not the same thing, I already noted your link worked. It doesn't show up as a path to choose when you go to energy on the phone, but it does on the website. Or maybe it's just the iphone X. There are 5 links that show up on the website under energy that weren't showing up on the phone which allow you to switch to solar roof. See the two pictures below, one from my desktop and one from my phone.
Either way it's still there, it's just a design error it seems with the phone.