Messages Not Syncing One Thread to 1/5 Devices
I know there are a lot of questions posted about Messages failing to sync with other devices. But I'm having what seems like a more complex issue.
Messages is successfully syncing every message to every device (5) on which I'm signed into iCloud. Except one single thread.
But what's weirder is that this single thread isn't syncing on only 1/5 devices. So on all the other ones, this thread also syncs successfully.
Things I've done so far:
- Turn off/back on phone.
- Restart Mac (M2 Mac Mini, Sequoia 15.1) that isn't syncing.
- Turn off/back on iMessage in phone (16 Pro, iOS 18.1) Settings.
- Ensured all 5 devices are updated to the latest OS.
- On Mac that isn't syncing, go to Settings>Apple Account>iCloud>Messages>Sync Now>Manually Sync. When I do this, it shows the most recent sync is lagging. But the manual sync doesn't update the thread that hasn't synced.
- On iPhone, Settings>Apple Account>iCloud>Messages>Sync Now>Manually Sync. It shows the most recent sync is a minute or two before I manually sync. Manually syncing does not update the thread on the Mac that hasn't synced.
I can successfully send from the non-syncing Mac within this thread. And my sent message syncs across devices. But the replies do not.
What else can I try to resolve this?
iPhone 16 Pro