I finally got it working after following the instructions, other than the only thing I did a little different was, after signing out from iCloud on my phone I deleted all the data, then when and disabled iMessage... Then enabled by clicking sign in and used my iCloud.com email address... I think everyone gets one, just is the same as their regular or initial apple id except it ends in @icloud.com signed in, same password as your apple id, now one IMPORTANT thing is, if you have @icloud.com checked on your mac or whatever device, it seems to need it checked on your phone too... So I did that when it was activating iMessage... After that went and activated the text message forwarding and the code popped up right away... 🙂 Am glad and wish I had known this long ago, because I've had the public beta since it came out and then thought it was the beta that had issues the last while... but just apple not being clear enough and most likely some bugs to work through...