Level 1 (18 points)

Apple Watch Series 9 Reminders not syncing after iPhone upgrade

I'm having an issue with my Apple Watch Series 9 (watch OS 27).

I recently upgraded my phone from a 12 mini to and 18 Pro (iOS 27) and everything seems to be settling down apart from one very frustrating issue for me personally. The watch is no longer reflecting any reminders in either the calendars or in the Reminders app itself.

I use scheduled reminders a lot as it just helps me organise my life.

I've tried everything I can think of or find online:

Reset Sync Data
Restart devices (in numerous different orders)
Toggled on and off in iCloud settings
Deleted and re-installed app

Does anyone have a definitive solution to getting me back to where I was as, like I said before, it was absolutely fine with my old 12 mini.

Posted on Sep 26, 2026 3:22 AM

2 replies

The_Captain_Haddock Author

Level 1 (18 points)

Sep 26, 2026 12:49 PM in response to poonam_kumawat

EUREKA!!

I followed your guidance and when checking that everything was on the same iCloud account spotted that in the Apple Watch app it had the correct account but it wasn’t signed in. I signed in and now everything seems to be there.

thank you

poonam_kumawat

Level 4 (1,080 points)

Sep 26, 2026 10:17 AM in response to The_Captain_Haddock

Since the basic reset/sync steps haven’t helped, check that the reminders are actually stored in iCloud. On your iPhone go to Settings -> [your name] -> iCloud -> See All -> Reminders and make sure it’s enabled. Apple says iCloud reminders should appear on the paired Apple Watch automatically.

Also check iCloud.com -> Reminders to confirm the lists are there. If they are, but still don’t appear on the Watch, Apple’s troubleshooting guide recommends checking iCloud status, software versions and that both devices use the same Apple Account.

More info: Apple Support – If your iCloud Contacts, Calendars or Reminders aren't syncing

Originally posted at discussions.apple.com/thread/256365317