Cannot send iMessages on my Mac but can receive them

I started having this same issue a few days ago (March 2018) - not able to send texts from my iMac, though I was receiving them there along with my other devices. I tried a few of the suggestions posted earlier in this thread but they didn't work. Then I tried midoz's suggestion and it solved the problem.

I had this same problem. I could receive iMessages but not send them on my Mac. I went through all the various steps that were mentioned with no luck. I was even able to text Android phones and receive texts on my Mac, but not able to send iMessages in the message app on my Mac. Then, I just decided to turn iMessage off on my iPhone in settings. When I did this, I was able to receive iMessages on my Mac, but now I couldn't on my iPhone. I turned iMessage back on in settings but nothing changed until I closed out the iMessage app on my iPhone and reopened it. Suddenly everything is working as it should. It was frustrating for some time. There seems to be some glitches in the software. Hopefully this will help someone with the same issue.

Deleting com.apple.facetime: registrationV1 from Keychain Access just worked for me!!! (The previous 3-1/2 pages of things didn't.) I did not have this problem appear until I updated from El Capitan to High Sierra recently.

Another success -- my husband lost the ability to send iMessages from his computer two years ago. Deleting the com.apple.facetime: registrationV1 password worked for him, too. (I am now giving him grief for not being able to fix this himself -- his reaction was to install WhatsApp and grumble about Apple being idiots. My reaction was to track down a solution, and roll my eyes at Apple when I saw what it was. Keychain is a train wreck...)

I have had this problem for several months and have searched at various times and tried suggestions for a fix. Was looking today and saw this. It worked. My problem originally began after an update. Thank you! So happy!

For the past 16 days the issue of my 2015 MacBook Pro was not able to send iMessages however was able to receive them. MacBook was also able to send and receive SMS messages. Just couldn't send the iMessages. I began with searching for a solution on the web via google. Read some very good information on this subject but nothing worked. I have gone through all the normal restart / reboot / sign out of iCloud / sign out of messages and FaceTime on all devices. I have gone through the extremes as well by restoring all 4 of my devices from back up as well as new. Yeah no kidding. Called Apple Support which tried its best to help and I had another call scheduled today with their level 3 team to address this issue.

And then I began reread the this forum again to see if I missed something. I had. I missed reading the solution provided by cabrownfromottawa. I followed the directions as they were written. This quick fix WORKED! Still not sure how a line in the keychain appearing to be meant for FaceTime fixed this issue for the Messages app. I am certain that this has to do with proper registration of a given device on the Messages server however am surprised and happy that this fix worked. Thanks cabrownfromottawa for checking in and posting.

I have to laugh. I had the same problem, Cannot send iMessages on my Mac but can receive them, and I tried your trick of unlocking and then locking Keychain Access. Magic, my problem solved. Thank you for the tip!

midonz's solution worked for me. The problem just started out of the blue. I had not changed my login nor upgraded the OS. Nothing. So I don't know why it started happening. Luckily I found this post quickly and helped me not waste tons of time trying to figure it out. I bumped his solution up with another 'Helpful' point. Thanks.

I had this issue of not being able to send the iMessage using my Mac even though I was able to receive them. I followed the above listed very simple steps and it is working perfectly now. Thanks for the instructions.

✅ BINGO! Thanks a million for posting your solution! I referred another user to it. After much adieu including locking and unlocking the Login Keychain, all to no avail, your solution fixed this problem for him, much to his relief.

I've read the user forums often but have never responded. But I have to point out that for this problem, I tried several solutions offered in this thread, and this is the one that worked for me. Thank you!

Well that was a lovely way to spend the day. Turns out that although in Settings on my iPhone I showed a login at my main Apple ID, under >Messages >Send & receive the login Apple ID was an older ID I'd not used for a couple of years. Can't get my head around why or even how that works. All fixed & working now thanks to Linc Davis' response below.

This raises another issue - why can we not delete an Apple ID we prefer to not use any more? Or can we now do that?

Turns out that although in Settings on my iPhone were logged onto my main Apple ID, under >Messages >Send & receive the login Apple ID was an older ID I'd not used for a couple of years. Can't get my head around why or even how that works b/c I wouldn't have entered it and that ID no longer exists. All fixed & working now thanks to Linc Davis' response below.

Thank you so much!!! This was driving me crazy and everyone else's answer was so long and convoluted, I gave up!!!

Works like a charm now! I'd be at my computer, receive an iMessage and could not answer. It would always say...undelivered!

Thanks again!

Thank you so much!!! This was driving me crazy and everyone else's answer was so long and convoluted, I gave up!!!

Works like a charm now! I'd be at my computer, receive an iMessage and could not answer. It would always say...undelivered!

Thanks again!