some iCloud data isn't syncing

Thanks. Also it works for me. Sign out then sign in again, the error message disappeared.

Cheers, I’d like to buy you a case of beer. Changing passcode to 6 digits on the other device fixed my inability to resume syncing.

I had the same problem here as well, what I did was, when you press the 'Resume Data Sync', it will ask for your passcode (I have tried at least 10 times before this message popped up, I think you might need to wait for a quite while), after put in my passcode, I left the phone overnight, until the next morning, then the message 'Reset End-to-End Encrypted Data' pop up. and you pick 'continue'. Then everything is fine.

The message 'Reset End-to-End Encrypted Data' might take quite a long time to pop up.

So ktc97 is correct!

I didn't check the icloud contents. I backed up the phone using iTunes, then restored it... the alert went away.

I managed to get rid of this messsge by

going into settings - Apple ID - iCloud - turn on passwords and key chain

I did a iCloud back up first

hope this helps

Fixed for me by signing out and back in. 12mini

I did this but had an issue turning on password and keychains, it also kept freezing.

What worked for me was actually changing my password pin from 4 digits to 6.

After that changed, iCloud let me turn on the password and keychains, and the reset end to end encryption popped up (never got that pop up before). After clicking reset (health and all other data were fine), it finally let me resume data sync.

Hope this helps

I was getting the Security Key prompt across all of my devices (ipad, watch, iphone, imac and mbp) -- and following along this thread, I erased all content and settings from the ipad...and lost everything (health, fitness, wallet cards, etc.).

Getting things set back up, I've had to re-set all AirTags and my airpods registered to me...they did not automatically reconnect when I reset and signed in.

So frustrating...years of health and fitness data lost. And now my messages still aren't syncing to my iphone the way they used to.

I've done about 5 hours of calls with tech support, submitted logs from all devices, and screen recordings to show the issue...and Apple said no one else had this issue.

Logging out of my iPad and logging back in worked for me but.. to log back in took a real effort. Many failed attempts, tried changing passwords .. failed. Eventually I had to gather all my apple devices and ended up with a 6 digit verification code sent to my phone that worked.. 👍🙂

Can you remove the old device from “trusted devices”? From the top of settings, select your name, scroll to bottom to see trusted devices. I’m having the same issue, says health data, maps and passwords not synching? I don’t use the health data, and don’t save passwords. Someone mentioned Google maps? I’ve had many other issues as well, now wondering if it is referencing Google apps? I would not think Apple would track passwords on Google. And Health is turned off, I’ve never used it, but at one point, it had someone else’s data in it? And I really wonder what passwords are sharing with the cloud?

Thank you. for this. Signing in and signing out worked for me and made sense. I had just updated my Apple ID password.

Thanks for sharing!!!

I'm experiencing this issue across all devices after upgrading to iphone 15 and the newest OS on everything. My health, fitness, wallet, etc. is not syncing and messages and other data is very inconsistent now.

Are you saying that the reset data option truly didn't erase your health or fitness data? I'm still waiting to hear back from apple after a 3 hour call last Saturday but will share this thread with them if you can confirm you really didn't lose anything in the reset!

"Under settings I had a notification that some of my data wasn’t syncing,

and when I clicked resume sync I got the pop up that I must resent end

to end encrypted data"

I did not get this popup. The spinny thing to the right spun for a while and then stopped. The error message remains on the settings screen.

Had same issues, worked it for 4hrs (dirty loop), then msg apple apple teir 1 couldn’t help, then teir 1 offered apple advance call back, i was too hungry and tire..lol.

Google search led to: give Credit to “foneDog’s blog” i can’t post link kinda risky. Am sure if you search you’ll find it.

SOLUTION:

Do iCloud Backup (iCB) manually, then auto (iCB) will work;

MUST BE ON/ACTIVE RULES

Rule #1.  iCloud

Rule #2 Passwords/Keychain

Rule #3 iCloud Backup

Please lmk if that helps, if not what other issue are you having?