iCloud Sync not working with iPhone, works fine for Mac.

I've been working on an app. It uses iCloud syncing. 48 hours ago everything was working 100%. Make a change on the iPhone it immediately changed on the Mac. Change on the Mac, it immediately changed on the iPhone. I didn't work on it yesterday. I updated to iOS26.4 on the iPhone and 26.4 on the Mac yesterday instead.

Today, I pull up the project again. I made NO changes to the code or settings.

Make a change on the iPhone it immediately updates on the Mac. Make a change on the Mac, nothing happens on the iPhone. I've waited an hour, and the change never happens. If you leave the iPhone app, then return, it updates as it should.

It appears that iCloud's silent notification is to being received by the iPhone. Anyone else having the issue? Is there something new with iOS 26.4 that needs to be adjusted to get this to work? Again, works flawlessly with the Mac, just not with the iPhone.

The issue is resolved in iOS 26.4.1.

Let's hope they added some tests so it never happens again.

I have tested my apps, the sync issues have been fixed in iOS 26.4.1. Cross syncing between 26.4.1 and 26.5 beta works fine too.

Yes, fixed in 26.4.1 😅

Even with the 26.4.1 fix from iOS, I'm still having iCloud sync issues between iOS and WatchOS 26.4. Anyone else seeing the same thing? WatchOS hasn't had an update.

I am still experiencing the same issue as before on both iOS 26.4.1 and macOS 26.4.1!

Filed as well: FB22468964

Very sad that this is my first forum contribution.

iCloud Sync not working with iPhone, works fine for Mac.
 
 
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