I don’t have this update
I don’t have update iOS 16
iPhone XR, iOS 15
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Why not?
What happens when you go to Settings➜General➜Software Update?
click here ➡️ Update your iPhone or iPad - Apple Support
If it says iOS 15.1.7 is up date, check Settings ➜ General ➜ VPN & Device Management and make sure you don't have a beta profile installed. If you do, remove it form there. Restart your iPhone, and try again.