I can't sign in iMessage on Sierra.

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• I can't sign in iMessage since upgrading to El Capitan - Suggestions?

  I can't sign in iMessage (Macbook Pro, early 2011) after upgrade to El Capitan 10.11.1 OS x 10.8.5. I have reset the passwords for my two Apple ID, out of the iCloud, signed and still cannot connect in iMessage. Diagnosis: "year error occurred during authentication.  All other applications (and machines, see below) with iCloud connections & shared data work without problems. Machine also crossed several reboots at least two resets of LANDAU. Any suggestions for next steps?

  The same update of the iCloud OS X 10.8.5 log 10.11.1 and subsequent out / in the sequence was repeated on my other Macbook Pro (mid-2012).  iMessage balls in and functions properly in this regard.

  My iPhone 6 + wife 5s and iPad Mini 1st generation (all with the same Apple ID & iOS 9.1), either have no problem with iMessage. Two Macbook pros are running 16 GB of RAM drives, backup of OWC data with the 480 GB SSD boot in original position of HD floppies and mechanical in the optical Bay. All devices are on the same time zone time, selected auto (CST).

  Updated - repair of Ran in Keychain Access.  Ran disk first aid utility.  Restart in Mode safe and by logging in to my account resulted in functional iMessage.  After restarting mode Normal iMessage remained functional.  A VICTORY.

  RT-Jhnsn

• Could not sign in imessage. An error occurred during activation.

  Hi all -

  Just started doing this message this morning after signing imessage and restart. I get the same error for facetime on mac. I've updated to 10.11.6 July 23. I have a serial number for the mac. I stop and cleared NVRAM memory at least 5 times. Any help/ideas would be appreciated. Thank you very much.

  Hello pawwright,

  Thanks for this info and choosing the communities Support from Apple. I know how important if iMessage working on your Mac is up to you! If I understand correctly, you can not sign in iMessage on your Mac since the update of OS X El Capitan and get an activation error message. I would start with the procedure described in this article:

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

  Also, if you are using an iPhone with iMessage, as well as on your Mac and other devices, I try to connect on iMessage on all your devices, restart your iPhone and sign in on your iPhone first iMessage. If iMessage activation is successful, then try to connect in iMessage on your Mac again.

  See you soon!

• Unable to sign in imessage: an error occurred during activation. Try again.

  Greetings,

  I just got my board battery and logic changed on the apple store, and since I can not sign in imessage. I get the following error: an error occurred during activation. Try again. I tried to reset the NVRAM, but I still get the error. My internet connection is fine, my e-mail works.

  Thank you for your help.

  Hello

  Open the purpose of this Mac from the Menu of the Apple icon top left point.

  Tab preview is to display the serial number.

  If this is not iMessages will not work (resetting the app just does not this account)

  Return to the repairer and put back it on the logic board (this is supposed to be part of the process)

  If you check it matches what is on your Mac (back, down, or battery compartment)

  If it is 'false' then get his change.

  There is a chance that this has also blocked using Apple ID for iMessages by this computer on the iMessages servers.

  The serial number is used to provide a specific connection of the device.

  IF this does not work after correction or get the serial number to the logic board, you will need to contact the Apple Support (same as Apple Care).

  Once you have explained that it is a matter of Apple ID, he should be free to Fix.  This does not mean that the person of level 1, you talk to knows what to do (they lead script for Apple care issues)

  Ask politely to speak to someone more important.

  Even in this case they may insist on collecting data and hoop jump.

  Based on others who responded that it now gets the engineers involved (the question happens separately the question of the logic board)

  Insist that the server is given regarding the use of your Apple Mac.

  Update or upgrade does not work and neither did a reinstall.

  Even in this case, they can tell you that it could take days for a resetting to filter through.

  

  20:43 Friday. June 10, 2016

   iMac 2.5 Ghz i5 2011 (El Capitan)
   G4/1GhzDual MDD (Leopard 10.5.8)
   MacBookPro (Snow Leopard 10.6.8) 2 GB
   Mac OS X (10.6.8).
   iPhone and iPad (2)

• Mac Pro doesn't let me sign of Imessage.

  Hello

  I have always been signed out imessage on my MB pro since the update to el capitan, Lion, a month ago. I managed to close the session at this time by going to Preferences-> account and disconnection.

  Yesteryday I decided to log in imessage to try again. After playing with him for a few minutes, I decided that I don't really need to use this feature and tried to disconnect. I couldn't do it. When I go to Preferences-> accounts, I can see my Apple ID, but there is no option to activate/signout etc. It displays a blank page to the right. Also I get notifications of imessage even after turning off the notifications in the settings. I restarted the computer and exit the application several times, but I stay connected and receive messages. Go to settings-> internet-> accounts-> icloud does not show imessage to check off / Imessage (spent) can also be seen running on the monitor of activity even after the abandonment of the app. If someone knows a way to stop this, please let me know.

  Thank you.

  System Prefrences > iCloud > Account Details > Contact

  Hope this helps, good luck to you.

• I can't sign in iCloud currently on my MacBook Air?

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  Tap your id in settings > iTunes and App Store and tap "sign out" on the context menu and connect you then back with the version update of your account. Similarly, if you use the same account, log in and return to iCloud, FaceTime, and Messages: what to do when you have changed your Apple ID email address or password - Apple support

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