Can't use imessage or FaceTime on MacAir
I just bought a new MacBook Air (macOS High Sierra version 10.13.6), I signed in with my iCloud and everything looks fine. But, for some reason, my iMessage and FaceTime don't sign in. It says that an error occurred during activiation and that it couldn't sign in.
MACBOOK AIR (13-INCH, 2017)