Received notification of Detect Compromised Passwords

Hey,

I received a notification headed; Detect Compromised Passwords.  The message stated iPhone can securely monitor your passwords and alert you if they appear in known data leaks.  HIGH PRIORITY RECOMMENDATIONS.  It identified all my contacts, individually (black background)  then in blue 'Change Password on website'.

Did this notification come from Norton, if not, how were my contacts listed without Norton identifying a breach of my security.

"This password has appeared in a data leak" notice on iPhone
https://discussions.apple.com/thread/251863281

I’ve just have a data leak password warning
https://discussions.apple.com/thread/254635197

iOS saying that >300 passwords have appeared in a data leak.
https://www.reddit.com/ios_saying_that_300_passwords

Why You Received the Data Leak Notice from Apple
As part of the Security Recommendations feature, Apple continuously monitors data leak information for any passwords saved in a user’s iCloud Keychain. In the simplest sense, Apple is comparing your stored credentials to databases that contain leaked login credentials. If Apple detects a password match, it issues the data leak notice and presents it on your iPhone or iPad.

https://firewalltimes.com/data-leak-notice-on-iphone/ 

I'm Norton user.  I'm not Norton. 

How would Norton Dark Web Monitoring know your passwords? 

Dark Web Monitoring for the United States
https://support.norton.com/sp/en/us/solutions/v136586160 23-May-2024

Hey thank you for replying to my message, if iPhone identified the breach, why did norton dark web not work.  Does that mean all my contacts are compromised and Norton did not work? There could be up to a hundred addresses listed.

seems like notification came from iOS

iPhone can monitor your passwords and alert you if they appear in known data leaks.

Go to Settings  > Passwords > Security Recommendations, then turn Detect Compromised Passwords on or off.

https://support.apple.com/guide/iphone/change-weak-or-compromised-passwords-iphd5d8daf4f/ios


Care to share: are you an ATT customer?


https://haveibeenpwned.com/

https://haveibeenpwned.com/Passwords

https://lifelock.norton.com/breach-detection