Tv provider is missing on Apple tv

You are NOT alone. I have owned every iPhone since launch. I have had every TV since launch. I own and iPad Pro and have had several of those. I have owned an iMac for the last decade. I am the guy everyone calls when they are having a problem, and for the first time in my life, I called Apple Support for this very same issue! “TV Provider” has disappeared from settings on ALL of my devices (TV, iPhone, iPad Pro). No update to iOS to cause this (they haven’t released one since around the first of the year). Can’t understand how this just disappears from settings? And yet, after explaining to the tech what Single Sign-On was and where it was in settings, she confirmed (via screen sharing) that it, in fact, has disappeared from where it is supposed to be. They have no known cause and no known estimate for a fix. Called a relative and had them confirm that it has, indeed, disappeared for them, too.

On what device is this happening?

What is your model Apple TV? Identify your Apple TV model - Apple Support