Grey Ed out Apple ID on iphone
Why is my Apple ID greyed out on my iPhone
iPhone 13 Pro Max, iOS 16
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If an app or feature on your device is not working or is restricted, it may have been disabled using Screen Time, or by an IT administrator if you are using a device owned by an employer or educational institution. Read this document about using Screen Time on an iPhone, iPad, or iPod touch --> Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support
Tap Settings > Screen Time > Content & Privacy > scroll to Allow Changes.