The fake "A user just logged into your Facebook account from a new device iPhone 11 Pro" email below is a scam. Therefore, recipients are asked not to follow the instructions in it, they should just delete it. The fake email is a phishing scam sent by cybercriminals to steal potential victims' account credentials.
The "Facebook User Logged into Facebook Account From iPhone 11 Pro" Scam
From: FB [zdezed@arminagera.site]
Date: Tue, Oct 27, 2020 at 4:31 PM
Subject: FB : Someone tried to log into your account, user ID: #639072799
Facebook
Dear,
A user just logged into your Facebook account from a new device iPhone 11 Pro. We are sending you this email to verify it's really you.
Report the user
Yes, me
Thanks,
The Facebook Team
Facebook users who have already been tricked are asked to change their passwords immediately before their accounts are hijacked and used fraudulently.