Phone disconnection notification?

Note: Please do not post Personally Identifiable Information like email address, personal phone number, physical home address, product key etc.
I was notified of an AT&T phone disconnection and I do not and never had
an phone plan with AT&T?
Issue abstract:

Detailed description:

Product & version number:

OS details:

What is the error message you are seeing?

If you have any supporting screenshots, please add them:

notified? how? by who?

Notified by Norton

Dark Web Monitoring notice?

Dark Web Monitoring
https://support.norton.com/sp/en/us/home/current/solutions/v127344370

Learn more about the Dark Web notification
https://support.norton.com/sp/en/us/home/current/solutions/v135502210

Product & version number:
OS details:

A phone disconnection notice by AT&T
Never had a phone number with AT&T

Maybe, you personal information registered with Norton was associated with a related breach.

Dark Web Monitoring
https://support.norton.com/sp/en/us/home/current/solutions/v127344370

Learn more about the Dark Web notification
https://support.norton.com/sp/en/us/home/current/solutions/v135502210

Was the notice a general information notice or a notice specific to you?

For questions on Dark Web Monitoring, read - Other frequently asked questions on Dark Web Monitoring
To know about a notification you received, read - Why am I receiving a notification that my information is found on the dark web?
To update your information, read - Update your financial accounts, mailing address, and other personal information for Dark Web Monitoring

I did change the registered number with a monitored item
Maybe that’s it?

Yeah, the pieces of the dark web puzzle may not always fit neatly together.
When Dark Web Monitoring detects your information on the dark web, DWM notifies you to gain awareness.
And the notice was specific to you and not a general information notice?

I just added the number I changed, of a monitored item
to my profile, maybe that was it. Thank you. I’m pretty
new at this stuff, Appreciate it. If you can think of anything else
I’ll read it

Frequently asked questions

https://us.norton.com/feature/dark-web-monitoring