iMessage/FaceTime "Error occurred during authentication" for Mac
Hello,
I have a MacBook Air running on macOS High Sierra 10.13.1 and aftering updating it two nights ago, I can no longer log into either iMessage or FaceTime with my Apple ID.
I did everything listed on this page: If you can‘t sign in to your iMessage account or FaceTime on your Macand none of it worked. I even changed my Apple ID password. Everytime I try to log it I either get "An error occured during authentication" or "An error occurred during activation." I don't know what else to do.
Please help! Thank you.
MacBook Air, macOS High Sierra (10.13.1)