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I'm unable to send iMessages from any Mac where I have also signed into iCloud.
If I create a new account and do NOT sign in to iCloud, I can sign into iMessages and they will send and receive.
If I create a new account and DO sign in to iCloud, I can sign into iMessages and the will receive but not send.
After the account has been signed into iCloud - it does not matter which Apple ID you sign into messages with, none of them will send messages.
This is reproducible across three different Macs, and across clean install of MacOS.
Can anyone tell me what signing into iCloud might touch or sync down that could break the sending of iMessages? Happy to fiddle around and trash preferences, have been through the list of deleting every iMessage preference I can find and signing in again but no luck. Signing out of iCloud doesn't help, once the account has been logged into iCloud once, sending iMessages is forever broken.
My theory is the iCloud syncs down a broken preference or something in Keychain? Any ideas what I could look for? It’s not Apple ID specific so it’s got to be a bad preference or something.
invig
Posted 2018-06-03T19:52:16.360
Reputation: 1
This really sounds like a question for AppleCare. Someone may need to look into what's going on with your account from the server side. – Spiff – 2018-06-03T21:07:55.737
By the way, what versions of macOS on the Macs in question? Also, are you signing into iCloud with the same Apple ID as you use for Messages? One last thing: Are you using ancient password-only authentication, or semi-ancient two-step authentication, or modern two-factor authentication? I remember there being some hassles with two-step authentication, that cleared up once I was able to move to two-factor authentication on all my devices (which I believe required making sure I was on modern enough OSes all around two support two-factor everywhere. – Spiff – 2018-06-03T21:14:35.633