Message after logging into Facebook

Please have a look at the article

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

"If your web browser displays annoying pop-ups

While browsing the web, if you see a pop-up or alert that offers you a free prize or warns you about security problems or viruses on your device, don't believe it. These types of pop-ups are usually fraudulent advertisements, designed to trick you into downloading damaging software or giving the scammer personal information or money.

Don't call the number or follow the links to claim the prize or fix the problem. Ignore the message and simply navigate away from the page or close the entire window or tab."

Old scam. Note the bad English in the message with the blue background. Apple may not make all its products to everyone's liking, but their English is above reproach.

No one, not even Apple, can remotely "scan" your computer remotely without your express permission.

https://verywelltech.com/en-us/technology/what-do-you-know-about-844-area-code-scam-all-you-need-to-know/