I have same issue. My wife's iPhone was purchased from the Xfinity store and and Catherine does not work on her iPhone 7. My iPhone was practice in the Apple Store and slapping her Sim card into my phone puts me to the same website up activation required to set up a hotspot. However, if they put that same Sim card in Xfinity mobile LG hotspot works.so I am assuming that problem is not with the Sim card but it is with their system talking to Iphone.
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