Apple id
I just received an alert on my phone that my Apple ID was being used on a new Apple Watch. I do not have a new Apple Watch. What do I do?
iPhone X, iOS 14
It is possible it is somebody phishing.
Recognize and avoid phishing messages, phony support calls, and other scams - https://support.apple.com/HT204759
If you are uncertain about a message and a resource provided in that message, do not click on any links. Try to independently verify the resource by going to a support page on apple.com and use that to contact Apple.