macOS 27.0 / iOS 27: SMS and RCS fail with Not Delivered on Mac; iMessage works

I contacted T-Mobile and they had nothing on their end. I then contacted Apple Support and they said my emails/phone # were not registered for use with iMessage. That makes no sense since iMessage is working fine across devices, but they sent me to submit a request to activate it and that I'd have an email in ~24 hours when its ready. I'm still waiting on that email, about 12 hours to go. Fingers crossed. I'll post an update after that comes in.

I am having the same problem, but apparently it's only SOME Android users (green bubbles).

A friend fails, but I can send messages to my nephew. I don't know the difference between their phones/carriers.

I'm on the phone with Apple support now trying to resolve the issue.

Now they claim that I have to call my carrier (T-Mobile) because this is an RCS/SMS issue.

I'm completely disgusted.

This is how I seem to have resolved the problem, at least for now.

1. Send message to problem Android phone #, it fails.
2. My husband sent me and problem # a message....which worked.
3. I replied to that message...which worked.
4. Problem # sent me a message...which worked.
5. I sent problem # a message...which worked.

Now the problem is gone for me with that number. I don't know why or how this series of steps fixed the problem for me (on both iOS and MacOS).

I called my carrier (at Apple's insistence) and they were nice but also said "weird, huh?" Apple has now sent my case to engineering. They are supposed to call me back in the next few days (or email me, I'm not sure which).

This kind of transient problem is often quite difficult to pin down unless it happens every time.

We are seeing a similar issue. My wife’s iPhone 11 running iOS 27 can still send texts to Android devices, but her iPad cannot send texts to them and gives a consistent “Not Delivered” error. Her iPad can receive texts from Android users. I suspect something is broken in the iPhone’s text forwarding capability, but we haven’t found a way to fix/reset it. All this worked as expected prior to iOS 27. Strangely, this behavior does not occur on my iPhone 16 Pro Max running iOS 27 and my iPad. All still works as expected.

Yes, happening to me too. Just restarted both my iPhone 15 Pro and my MacBook Pro (13 in M3). Signed out of iMessage on Mac and signed back in. Turned iMessage off on iPhone and turned it back on and ensured forwarding is enabled. I don't use iMessages in iCloud so nothing to do for me there. Green messages do not appear on the Mac after being sent on iPhone in this state. This certainly seems to be a Golden Gate bug...

Same issue here. All worked fine prior to the '27' update, but afterwards my Mac Mini M4, MacBook Pro M5, & iPad Air 4 all fail to send RCS/SMS messages. They still receive them just fine. My iPhone 16 Pro Max is also working as expected.

I've tried numerous fixes - restarts, enable/disable various settings, log in / out of iCloud, and more - and nothing has fixed it. I've stopped short of calling my mobile carrier or resetting network settings / my iPhone.

I am having the same problem and have tried to reset RCS with no luck. I can receive fine but can't send. I also can't start a new message from a contact with SMS/RCS as it is in red but if I do it on my phone it then shows up on my macbook pro. I sure hope there is a quick fix for this.

Same issue here. Group chat with neighbors, 6 total in group, 4 are iPhone and 2 are Android. Recently updated to new iPhone and now my Mac is no longer able to reply to the group.

So far I've deleted the message on my Mac and its disappeared on my iPhone/iPad.

Edit: received another message, now my Mac shows no reply box at all.

I ended up ceasing use of the Messages app on my Mac Studio and MacBook Air. I use it on my iPhone only now and, on occasion, will use iPhone mirroring (although, trying to attach documents or photos from my Mac into Messages via iPhone Mirroring seems to be not ready for prime time (despite having handoff enabled). Oh well, maybe one day it will be fixed.

Yes

My iMessage is not letting me activate I need help with it

I updated my Macbook Pro and my iPhone to 27.0.1 yesterday and still having the same problem. Hopefully Apple will find a fix for this soon.

Same issue here, just reported to Apple