10.13.4 beta 2

my imessage app not working at all (not launching). looks like its broken in beta 2 and beta 2 update 1

>i signed out and back in, I also signed out of Icloud and back in

Might not be enough...did you turn on messages in icloud too?

Stan on you imac remove imessage account in the control panel log out of your icloud also and your message app will open backup, its stuck trying tondo a hand shake between two devices and it cant, it sits there trying and trying loxking up the message app on the mac and iphone!!!! Nice going apple you f.... uckes this one up nicely

interesting that this was updated Jan 2018 this documents? can it be that imeesages some how are disabled on the server size? and need to be reset?

https://support.apple.com/en-us/HT204408

This entire imessage issue with Beta two is a big bug, i worked on it from 7 PM EST to 6 AM EST time and the only way you can come close to get it to work with out a lag on your phone is to setup a phone wipoing it and set up as a brand new device. One you get to a screen where it says Imeesage Authentication and you get ! over the messages app, you need to HARD RESET THE PHONE and then the phone part of the imessages will start to function and not LAG! and you will get a promt on the MAC OS to synch up your phone ID to use with imessages, now you also have to remove the number on your iphone and add back in for it to synch up with the mac OS, but there is always a but, the MAC OS still has the oiption grey and you cannot select ENABLE IMESSAGES IN THE CLoud, no matter what I do, clean for mat reinstall of the OS, wiping phone new isntall no data restored that option is greyed out, but it does get the system to the point where it's stable and does not lag on the messages just the Icloud part is broken still!!!!!!! big big issue and need to be fixed ASAP for BETA 3 release for sure...

On my 2015 MacBook Pro there isn't even an option. It's gone missing. No chance to enable Messages in iCloud.