Recently, Facetime on my work laptop stopped working properly. Even with the correct ID and password, the app would “verify” my account but then refuse to activate Facetime. Instead I would get this error:
The registering device does not have appropriate credentials
Thanks to this post:
http://porkrind.org/missives/imessage-on-mac-os-x-not-working/
I learned that a simple “killall imagent” command in the terminal would restore Facetime functionality!
Yay, internet.