iMessage suddenly decides to stop working

iMessage works fine on my iPhone 6 and iPad, but all of a sudden on my Mac, it will not be activated. It worked fine on the Mac until 15:00 yesterday. At home, opened my Mac and it suddenly stopped working with FaceTime. I keep trying to enter my credentials from Apple and it get the message that there is an error with the activation. Credentials still work in the app store, within this community and iCloud himself.

Note, I have a problem with iTunes Apple tried to fix last week, which included an update of the operating system and the keychain. He fixed the my account to iTunes for a few days, but I finally got an "error of processing of your application to iTunes Store" again which means I can't buy things via iTunes on my Mac, but it will make the app updates. Not a huge problem because I can always buy via my iPhone, but I don't know what the problem is recurring. My MacBook Pro is a former model - purchased Feb 2012. All updates have been made. But the iMessage thing is a big problem.

I was hoping that I woke up this morning and he himself would have worked out during the night. Tried a reboot.

Get help logging into Messages, FaceTime, and Game Center - Apple Support

If you get an error when you try to activate FaceTime - Apple Support or iMessage

Tags: Mac OS & System Software

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