Reminders won't sync to iPhone
Solution 1:
What worked for me:
- Disable reminders in iCloud settings
- Open reminders
- On the default reminders list create a random task, e.g. "Test"
- Re-enable reminders in iCloud settings
- "Merge" reminders
- Open reminders and wait for the sync to finish
Solution 2:
I had the same problem, until I realized that the in the iPhone's iCloud settings, Reminders is unchecked by default. So all I did - on my iPhone - was go to Settings > iCloud and then just activate Reminders. Within a few seconds all my Reminders between my iPhone and Mac were synced.
Solution 3:
on the date October 1, 2019 the problem is with Apple
iOS 13 came out a couple of weeks ago, but one thing you may have noticed is that Reminders no longer sync with Macs. Apple has now confirmed that Reminders won't update until its latest macOS update is made available.
The new version of Reminders for iPhone impressed us with its improvements in iOS 13.1. However, to sync Reminders between an iPhone and a Mac requires macOS 10.15, a.k.a. Catalina, which is released in the coming weeks.