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Recently, iMessage won't sign in on my MacBook Air (10.8.4). I opened up Messages a couple of days ago, and my iMessage account was signed out. Upon trying to sign back in, I get a message reading:
The registering device does not have the appropriate credentials.
And login fails. Anyone else have this issue?
Follow the steps listed on this page - http://support.apple.com/kb/TS4476
If that doesn't fix your problem, try checking your Date & Time settings (Settings > Date & Time). Make sure "Set date and time automatically:" is ticked, and that your time zone is correct.
Type:
killall imagent
in Terminal.app (in /Applications/Utilities) and then start iMessage and log in again.
That fixed the problem for me.
The solution here in this thread is how I ended up fixing this:
https://discussions.apple.com/message/22624648#22624648
I updated the Flash player for OS X, then went to Preferences → Flash Player → Advanced and told it to clear all browsing data from the local storage cache. After this, I rebooted and was able to login to iMessage on the Mac without the error.
Dumb that this interferes with iMessage, but this did fix it.
I had the same issue and I found out that somehow I was logged out from my account. Just check if that's the case with you. Open Messages application -> click on Messages (on the left upper corner) -> Preferences -> select Accounts -> and then, if you are logged out you will have to enter your iCloud password.
Hope this helps!
