Who I have the same questioned this topic

My iPhone X is running iOS 12 beta code.  I just noticed the other day that I cannot turn on personal hotspot on the phone.  Under Settings/Cellular there is a blue option for Set Up Personal Hotspot, but when selected it sends me to a now defunct web page for Verizon.  When I use a browser and login to Verizon, I see that my plan includes mobile hotspot on capable devices...

I'm not sure what I am missing or if this is a known issue with iOS 12 beta.