Apple Watch 2/FaceTime is possibly hacked? I received what appears to be a malicious message on my Apple Watch 2.  It did not arrive via any known messaging app.  There was no banner, only the words.  The words were threatening. I had recently been using FaceTime.  I checked my iPad and iPhone but theres no message there.  Then I went on my MacBook Air and a box popped up: "Your Apple ID and phone number are now being used for FaceTime on a new Apple Watch".  My Apple Watch is not a new Apple Watch. so I'm a bit alarmed.  Any advice?
That is not any threat. I think you signed into FaceTime on your Apple Watch using your Apple ID. So all your other apple devices will notify you. But your device doesn't know whether your Apple Watch is new or old. Even I got that message on my MacBook after signing in into FaceTime on my iPad. It is not a threatening message!