Hi, I've installed Sierra with multibeast/unibeast, and clover should have generated a valid serial number.
This seems to be the case since it pops-up at "everymac.com" and isn't used according to apple.
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I CAN sign into iMessage and iCloud. I receive a message on my iPhone iMessage is being used on another system and it works just fine on my MacBook Air.
But I can't seem to send any messages. They do not become blue and iMessage tries to send it through sms (which fails). Also calling through my iPhone fails.
I've already tried sign-out/in, deleting al the iMessage folders and tried again.
No luck....
What could still be wrong?