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break7bg
User level: Level 1 (48 points)

iCloud Syncing affected after OS and iOS updates to 27.

My Contacts on my Mac Air are no longer syncing with my iPhone after changes are made since updating to Mac OS 27. Why not? The syncing does not work either direction. All devices I have are running iOS 27 or OS 27. My iPhone is a 13. My Mac is Air. I am on the same apple id on all devices.


Posted on Sep 19, 2026 9:43 AM

8 replies

Mug
User level: Level 1 (41 points)

Oct 16, 2026 10:44 PM in response to break7bg

I finally got my contacts to synch by logging out of my Apple account on both my iPhone and my Mac, then logging back into both. It took quite a while for all of my contacts to show up on both devices. This also boots out all credit/debit cards in the Apple Wallet, so be ready for that.

WheelieNick
User level: Level 9 (74,110 points)

Sep 20, 2026 2:55 PM in response to break7bg

Hi there


Please try this


Make sure iCloud is actively allowed to sync contacts on both devices.


  • On your Mac Air:
    1. Open System Settings.
    2. Click your Apple ID (your name) at the top.
    3. Click iCloud, then click Apps Using iCloud (or look directly for Contacts).
    4. Turn Contacts on. If it is already on, turn it off, wait a few seconds, and turn it back on. Choose "Merge" if prompted.
  • On your iPhone:
    1. Open Settings.
    2. Tap your Apple ID (your name) at the top.
    3. Tap iCloud, then tap Show All under the "Apps Using iCloud" section.
    4. Make sure Contacts is toggled on. If it is on, toggle it off and back on again. 


monkan2
User level: Level 1 (14 points)

Oct 17, 2026 8:33 AM in response to Mug

This was very helpful. My contacts did not sync between Mac and iCloud.com. I logged out and back into my apple account on Mac as you advised. Now the syncing works again after some scary moments when everything seemed to be lost. I had to turn syncing on again for mail, contacts and icloud-calender. /Thank you

TheLittles
User level: Level 10 (211,627 points)

Oct 27, 2026 4:12 AM in response to Randy R Surf

“Does anyone know if Apple is aware of this? I have the same problem.”

———-


They would have, but only if left feedback on this. So,…


Report this to Apple:

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of you occurrences, if you don't report it to them.

  1. Go Here: Feedback - iPhone - Apple
  2. Select: "Bug Report" for the "Feedback Type"
  3. Comment: that this all began after installing an update. Include the URL of this thread
  4. Proceed from there as necessary
Mug
User level: Level 1 (41 points)

Sep 27, 2026 8:25 PM in response to WheelieNick

I have the same problem. I tried WheelieNick's suggestions, but to no avail.

I created a contact from a text on my 2025 Macbook Air with OS 27 and can't get it to appear in the phone contacts. This didn't happen before upgrading to OS 27.

Any other ideas?

break7bg Author
User level: Level 1 (48 points)

Sep 27, 2026 9:14 PM in response to WheelieNick

I have done these maneuvers already. Did it with the Apple Expert. The Contacts still do not sync. Thanks for trying!

break7bg Author
User level: Level 1 (48 points)

Oct 17, 2026 8:10 AM in response to Mug

I may need to try to do what you did before I wipe/restore my Mac M4. How do you know to try what you did? Other than credit/debit erasure, what else have you noticed that changed?

Randy R Surf
User level: Level 1 (13 points)

Oct 26, 2026 10:05 AM in response to break7bg

Does anyone know if Apple is aware of this? I have the same problem.

Originally posted at discussions.apple.com/thread/256360606