Can't sign in to iMessage on iMac

For a few years, I've been using iMessage without problem on my iPhone, iMac and macBook. But recently I've been receiving a few notifications on one or more devices about associating my phone number with my iMessage account (I think) and today, I can't sign into iMessage on my iMac. Or, at least, I can sign in for a few seconds before I'm signed out again. Any ideas, please?

Posted on Sep 9, 2025 8:32 AM

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Question marked as Top-ranking reply

Posted on Sep 12, 2025 4:04 AM

@baudiom, this is how I solved it in my case. I found I had to reactivate iMessage in my iPhone first:


If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support


In particular, make sure you complete step 1 of the subsection "Try to activate your iMessage or FaceTime account online" on that page.


Then I had to make sure messages were available on my iMac by selecting Text Message Forwarding:


Set up Messages on iPhone – Apple Support (UK)


I think this was all set up correctly until recently but I just had to go through the process again.


HTH


Ed

4 replies
Question marked as Top-ranking reply

Sep 12, 2025 4:04 AM in response to baudiom

@baudiom, this is how I solved it in my case. I found I had to reactivate iMessage in my iPhone first:


If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support


In particular, make sure you complete step 1 of the subsection "Try to activate your iMessage or FaceTime account online" on that page.


Then I had to make sure messages were available on my iMac by selecting Text Message Forwarding:


Set up Messages on iPhone – Apple Support (UK)


I think this was all set up correctly until recently but I just had to go through the process again.


HTH


Ed

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Can't sign in to iMessage on iMac

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