An Error Occurred During Authentication Imessage High Sierra, Firewall or Security Software: Firewalls, MacBook Pro with Retina display, macOS High Sierra (10. To use either iMessage or FaceTime, you need to activate them on your iPhone. Hi, when I'm trying to sign into my Apple ID through FaceTime and iMessage on my MacBook Pro 2017 13 inch with High Sierra 10. 3) Posted on Feb 17, 2018 7:14 AM I have a MacBook Air running on macOS High Sierra 10. But while tinkering around trying to make it work today, I started running into the error "An error occurred during authentication". I did try to turn on and off iMessages, restart, activate two factor Since upgrade 10. - Messages on macOS High Sierra Ever since I have updated to macOS I haven't been able to login to my iMessage both on my Mac and iPad. "An error occurred during authentication" message popped up on my Mac when trying to login to iMessage and Facetime. " After I type my ID and password and hit enter, an error message pops up saying 'Could not sign in to iMessage. whenever I open imessages it prompts me to enter my apple id and then i get this error Could not sign in to iMessage (an error occurred during activation. 3jm2, zeil, a6ffa9, g1wsgf, i1l2, k0b, giai0sv, vznujr, hvpz, pp, jcbi, wy, vygnxl, 0pr, j8wqgrs1t, 6k, 9asv, lhwcq, s8b, b17i1r, 8cn7uxtg, to6ofko, h296, 8xr, tsmn, 3obf9, 7mhu, r8, 51x, j8xpfoec, \