User level: Level 1 (28 points)I just upgraded to IOS 27.0.1 on iPhone 17. I am unable to sync keychain and passwords. When I try to turn it on, it turns itself off. Any ideas?
[Re-Titled by Moderator]
Original Title: iCloud Keychain sync problem
Posted on Oct 16, 2026 8:06 AM
User level: Level 1 (28 points)Oct 22, 2026 7:02 AM in response to ffernino
Progress! I removed an old 2013 iMac that was on my account. I still have it, but it was logging to iCloud. Anyway, on my iPhone I was unable to turn on Advanced Data Protection, which includes end-to-end encryption. Without that on, I was unable to sync passwords. Well, with the old iMac gone, I was able to turn on end-to-end encryption, and now the passwords are syncing. Why this didn't matter to my iPad, which still has it turned off, is beyond me. But this solved my problem. Thought I should post the solution in case anyone else is having the same problem.
User level: Level 7 (26,777 points)Oct 17, 2026 8:26 AM in response to ffernino
On the MacBook, sign out of your Apple Account. On your iPhone, see if you can then turn on iCloud Keychain. If so, on the MacBook sign in to your Apple Account again.
User level: Level 7 (26,777 points)Oct 17, 2026 7:28 AM in response to ffernino
Do you have other devices (Mac, PC Windows, iPad…) connected to your Apple Account?
User level: Level 1 (28 points)Oct 17, 2026 5:13 AM in response to 6x6
Thank you. The problem I'm having is that I can't turn it on. When I move the slider to turn it on, it turns green for a couple of seconds, then automatically slides left to turn it off. There must be some setting that is preventing it from turning on. I've tried all the tips I can find except logging out of iCloud and then logging back in. I'm concerned that if I log out of iCloud, I will have to go through setting up credit cards and Wallet.
User level: Level 1 (28 points)Oct 17, 2026 7:40 AM in response to ffernino
And on my iPhone, I am connected to iCloud for Mail, messages, Notes, etc. Also, when I upgraded my iPad to 27.0.1, it syncs Passwords just fine. So I'm thinking that there is some setting on my iPhone that is the culprit.
User level: Level 1 (28 points)Oct 21, 2026 2:32 PM in response to ffernino
An update.. Last night I signed out of iCloud on the iPhone I was having trouble with. Once I signed in... same problem. Today I visited an Apple Store for help. The technician assigned to me, Matt, tried several things, but none worked. He seemed to have a checklist of things to try. When we got to the step about resetting network settings, we agreed that that was far enough. Taking that step would have erased all the WiFi passwords and Network settings. We both agreed to just live with the problem and hope that the next IOS upgrade would solve it. However...Hope is not a strategy!
User level: Level 1 (28 points)Oct 17, 2026 7:35 AM in response to 6x6
Yes... M4Imac, iPad, MacBook
User level: Level 1 (28 points)Oct 17, 2026 12:21 PM in response to 6x6
Thank you, but that didn't work. I appreciate your help. I think I will head to the Apple Store one of these days to see if they can figure this out.
User level: Level 7 (26,777 points)Oct 16, 2026 4:50 PM in response to ffernino
Please see if this article can help: If iCloud Keychain won’t turn on or sync – Apple Support (UK).
Originally posted at discussions.apple.com/thread/256377304