Mac "Messages" can receive but won't send iMessages

[abernardi]

I know this has been covered, but nothing has worked for me. I'm on the last 17" Macbook pro 8,3, late 2011, 2.4GHz i7, 8Gb RAM, running High Sierra OS 10.13.6.

When I try to send a message from "Messages" on the Mac I get the familiar "Not Delivered" with the circled red exclamation mark right away.

I've looked through dozens of threads on this and other sites and have tried everything I could find including all combinations of signing in and out on the mac and iPhone, restarts, checking forwarding and making sure they have the same preferences.

I did have one interesting thing happen. I logged out of iCloud on the Mac and disabled messages on the iPhone (or maybe logged out all together, can't remember) and then restarted both iPhone and Mac and logged in only with Messages on the Mac, without logging into icloud for calendar, contacts, etc. and it worked for one message. I then logged back into icloud for all the apps that needed it and it stopped working. In fact I got an error when I tried to access the system pref panel for icloud and had to restart which brought it back. Any ideas?

 

[abernardi]

Nobody?

 

[BrianBaughn]

I suppose one possibility would be a networking issue…maybe DNS? See if changing your Mac's DNS server(s) to something else helps.

Another thing is that is may not be you. It may be them (Apple). In that case, a call to Apple Support would be needed.

 

[tbk]

I'm having this same issues. It's now inexplicably started happening for my partner too. I'm running Beta Catalina and iOS 14, and intending to switching back... but doesn't sound like that's the problem for you?

 

[ignatius345]

I'm running Beta Catalina

What's Beta Catalina? Do you mean the Big Sur Beta? Catalina's been released for about a year now.

 

[tbk]

Yes — meant beta Big Sur.

 

[maverick28]

I know this has been covered, but nothing has worked for me. I'm on the last 17" Macbook pro 8,3, late 2011, 2.4GHz i7, 8Gb RAM, running High Sierra OS 10.13.6.

When I try to send a message from "Messages" on the Mac I get the familiar "Not Delivered" with the circled red exclamation mark right away.

I've looked through dozens of threads on this and other sites and have tried everything I could find including all combinations of signing in and out on the mac and iPhone, restarts, checking forwarding and making sure they have the same preferences.

I did have one interesting thing happen. I logged out of iCloud on the Mac and disabled messages on the iPhone (or maybe logged out all together, can't remember) and then restarted both iPhone and Mac and logged in only with Messages on the Mac, without logging into icloud for calendar, contacts, etc. and it worked for one message. I then logged back into icloud for all the apps that needed it and it stopped working. In fact I got an error when I tried to access the system pref panel for icloud and had to restart which brought it back. Any ideas?

I get that too.