I received an email saying my apple id has been locked with a case number: 864846338
what does this mean?
iPhone 11, iOS 14
Question marked as
If you check the reply address, you will notice, that this is no official Apple Mail.
Someone is trying to trick you into giving them personal Apple ID information or details about your credit cart info.
Check this article about it:
Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support