iMessage Your message could not be sent. Person is not registered with iMessage.

Hi. I have installed El Capitan on my hackintosh without much issues. Everything seems to work except audio and iMessages. I never had any issues signing in or opening it, just this. I called Apple support (not telling them that I have a hackintosh) because some people on the internet where getting this error on their real macs. They where saying that it was a problem with Apples servers. Of course this got me nowhere. It has now been 3 days.

Error:
(On attempt to send message to confirmed...

iMessage Your message could not be sent. Person is not registered with iMessage.