My son and I both have the exact same iphone 7 on the same account, he had no problem setting up his hotspot, I however get the following
in Cellular->Settings there is only "Set Up Personal Hotspot", which brings up a dialog box with "To enable Personal Hotspot on this account, visit https://mobile.vzw.com/hybridClient/mvm/hotspot". It gives options for "Cancel" and "Go to Website". The latter option goes to a website that doesn't give any option to set up a personal hotspot.
Help!!