Just started getting this notification around November first. We noticed an unusual login from a device or location you don't usually use.

Hello rvrl,

This is coming from Facebook. This generally occurs whenever a device or an app is requesting to use your Facebook login. If you are unfamiliar with this login, then you will need to reach out to Facebook for support.

Facebook Help Center

Unfortunately, Apple Support Communities cannot help with this.

Cheers!

First impression.......this is a scam that might appear to be "official" looking, but it is more likely trying to trick you into revealing personal information.

Could you post a screenshot of the message please?

Hey rvrl,

Thanks for posting in Apple Support Communities. We understand that you're receiving a log in notification from a device or location you do not recognize. We'd like to help by asking a few questions first.

Does the notification look like the one shown in this support article?

Get a verification code and sign in with two-factor authentication - Apple Support

Is the notification to you coming via email, text message or voicemail?

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

How often does the error occur? Did you recently restore any of your Apple devices?

We look forward to hearing back from you. Take care.