I´ve been suffering the same as all. Both my genuine mac and hack stopped working without issues logging into iMessage, therefore tried to generate unique values on my hack, using iMac11,3 id, 12 digit SN and 13 digit MLB. I expected to get the Call Apple message with the code, but instead, I get the "activation error message, try later". I checked other things, like en0, etc, etc, but no luck; still getting the same message. I guess I´ll give it a rest for a few days and I´ll try again. I still don´t have iMessage back on my genuine mac. I used my apple id to log in using a friends genuine mac, and I was able to log in, and send a message with it. I hope I´m no repeating too much info. Thanks.