iCloud Contacts failing to sync after High Sierra

Most likely you are looking in the wrong Library. There are 3 library folders. You need to look in your User's Library.

Macintosh HD Root folders

Applications

Library

System > Library

Users > Library

Show User's Library

The User's Library folder is hidden by default. To unhide:

Option 1) Select the Finder in the Dock. Under Go in the Menu bar > hold down the Option key and you’ll see the Library.

Option 2) You can also select the Home folder in the sidebar of a Finder window.

Pull down the “View” menu and select “Show View Options”

Check the box for “Show Library Folder”

I just received an email from Apple saying they've closed the bug report I filed on this issue.

Since the latest macOS update I have noticed now that entries I make in my address book on the mac now get synced to iCloud, but it still seem that entries in iCloud don't come back to the mac. I will have to check more carefully on this.

Anyone else noticed that the issue is fixed?

I have had the same problem on both my 27" Mac and on my MacBook Pro, having been able to upgrade the laptop to Mojave OS the problem has gone however as Apple have decided my 2012 iMac is too old to upgrade the problem persists despite trying all the remedies offered here. Obviously this is a problem of Apple's own making and they don't seem bothered about sorting it. I am far from happy with this decision as my iMac is still more than capable of a few more years work, just a ploy to make us buy new computers!! 😠

Adding to this that it seems like contact pictures are particularly unreliable in terms of syncing.

I have seen reports that iCloud is having some issues resulting in sync not working as expected. Patience might be required while Apple fixes these issues.

Some of the files under your username are hidden. To find the correct Library follow these steps.

How to Show the User Library Folder in macOS Sierra - The Mac Observer

Thanks a lot! Only this one worked for me (delete everything with addressbook in it's name).

So I deleted the contact that I created on my iPhone that wasn't syncing to Contacts on my Mac, recreated it on the Mac, and now I find that it is not syncing to my iPhone. The fact that contact syncing is unreliable really undermines this platform in a serious way.

Thanks for the tip but alas it's not working for me. I tried deleting anything with 'addressbook' in the name in ~/Library/Containers and rebooting, to no avail.

My iPhone (running iOS11), my other Mac (running Sierra), and the address book in iCloud.com are perfectly in sync but my new Mac running High Sierra simply won't sync contacts. I can see the AddressBookSourceSync process running in the background and transferring data but none of the changes I've made to my address book since upgrading have made it into the new Mac.

Epic Fail

The solutions listed (deleting ‘addressbook’ files and starting over) only work for the first sync. Groups do not sync at all, ever; contacts never sync after the first instance. Incredibly frustrating.

I filed a bug under 35241894

It seems the possible solution from dianeoforegon is both involved, and runs risk of losing all of one's contacts. Would prefer a real solution from Apple at this stage. Many people reporting the same issue.

I am experiencing this issue to. My iPhone X synchronizes with the Safari accessed Contacts in iCloud, however the Contacts app on my 2015 MacBook Pro running High Sierra 10.13.1 does not sync. Need Apple to fix this bug!

This is a major problem for me. I need contacts from people I meet to sync with my computer, otherwise I'm forced to type in the information on my Mac running High Sierra. I'm sorry to say it, but it's yet another disappointment to add to the growing list of problems with the Mac computers operating system becoming inferior to iOS.

An additional piece of info is that I've noticed that I suddenly have #noname entries with no content in my contacts list on iCloud and on iPhone. When the original problem happened I noticed that the Group I had created to contain the new contacts plus some old ones had these #noname entries in it.

This suggests to me that High Sierra is creating a correct entry, then sending an empty record to iCloud (or a record iCloud/iOS can't read) and that iCloud/iOS then handles it correctly even though it contains no data.

And this gets weirder - I've just been messing around and creating 3 new contacts on MacBook, which added 2 #noname entries to the list in iCloud and the 3rd of those has been added to the contact list correctly in iCloud and in iOS. An entry created in iCloud doesn't get synced to HS on Mac book [cue Twilight Zone Music.]

Also weird is that colleague's MacBook pro (brand new and on HS) iPhone 6 and iPad air are experiencing none of these problems.

I am having the same issue as apple wanted me to reinstall the OS and start over, like when you get a new computer. However, last month iCloud contacts not updating on my the computer... I am working with an apple senior manager as the tech support team is working on it.